+++ /dev/null
-/* POSIX.2 wordexp implementation.
- Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
-#include <wordexp.h>
-#include <signal.h>
-#include <stdlib.h>
-#include <pwd.h>
-#include <sys/types.h>
-#include <string.h>
-#include <glob.h>
-#include <ctype.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <paths.h>
-#include <errno.h>
-#include <sys/param.h>
-#include <stdio.h>
-#include <fnmatch.h>
-
-/* Undefine the following line for the production version. */
-/* #define NDEBUG 1 */
-#include <assert.h>
-
-/*
- * This is a recursive-descent-style word expansion routine.
- */
-
-/* These variables are defined and initialized in the startup code. */
-extern int __libc_argc;
-extern char **__libc_argv;
-
-/* Some forward declarations */
-static int parse_dollars (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, int flags,
- wordexp_t *pwordexp, const char *ifs,
- const char *ifs_white, int quoted);
-static int parse_backtick (char **word, size_t *word_length,
- size_t *max_length, const char *words,
- size_t *offset, int flags, wordexp_t *pwordexp,
- const char *ifs, const char *ifs_white);
-static int parse_dquote (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, int flags,
- wordexp_t *pwordexp, const char *ifs,
- const char *ifs_white);
-static int eval_expr (char *expr, long int *result);
-
-/* The w_*() functions manipulate word lists. */
-
-#define W_CHUNK (100)
-
-/* Result of w_newword will be ignored if it's the last word. */
-static inline char *
-w_newword (size_t *actlen, size_t *maxlen)
-{
- *actlen = *maxlen = 0;
- return NULL;
-}
-
-static inline char *
-w_addchar (char *buffer, size_t *actlen, size_t *maxlen, char ch)
- /* (lengths exclude trailing zero) */
-{
- /* Add a character to the buffer, allocating room for it if needed.
- */
-
- if (*actlen == *maxlen)
- {
- char *old_buffer = buffer;
- assert (buffer == NULL || *maxlen != 0);
- *maxlen += W_CHUNK;
- buffer = realloc (buffer, 1 + *maxlen);
-
- if (buffer == NULL)
- free (old_buffer);
- }
-
- if (buffer != NULL)
- {
- buffer[*actlen] = ch;
- buffer[++(*actlen)] = '\0';
- }
-
- return buffer;
-}
-
-static char *
-w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str,
- size_t len)
-{
- /* Add a string to the buffer, allocating room for it if needed.
- */
- if (*actlen + len > *maxlen)
- {
- char *old_buffer = buffer;
- assert (buffer == NULL || *maxlen != 0);
- *maxlen += MAX (2 * len, W_CHUNK);
- buffer = realloc (old_buffer, 1 + *maxlen);
-
- if (buffer == NULL)
- free (old_buffer);
- }
-
- if (buffer != NULL)
- {
- *((char *) mempcpy (&buffer[*actlen], str, len)) = '\0';
- *actlen += len;
- }
-
- return buffer;
-}
-
-static char *
-w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str)
- /* (lengths exclude trailing zero) */
-{
- /* Add a string to the buffer, allocating room for it if needed.
- */
- size_t len;
-
- assert (str != NULL); /* w_addstr only called from this file */
- len = strlen (str);
-
- return w_addmem (buffer, actlen, maxlen, str, len);
-}
-
-static int
-w_addword (wordexp_t *pwordexp, char *word)
-{
- /* Add a word to the wordlist */
- size_t num_p;
- char **new_wordv;
-
- /* Internally, NULL acts like "". Convert NULLs to "" before
- * the caller sees them.
- */
- if (word == NULL)
- {
- word = strdup ("");
- if (word == NULL)
- goto no_space;
- }
-
- num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs;
- new_wordv = realloc (pwordexp->we_wordv, sizeof (char *) * num_p);
- if (new_wordv != NULL)
- {
- pwordexp->we_wordv = new_wordv;
- pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc++] = word;
- pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc] = NULL;
- return 0;
- }
-
-no_space:
- return WRDE_NOSPACE;
-}
-
-/* The parse_*() functions should leave *offset being the offset in 'words'
- * to the last character processed.
- */
-
-static int
-parse_backslash (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset)
-{
- /* We are poised _at_ a backslash, not in quotes */
-
- switch (words[1 + *offset])
- {
- case 0:
- /* Backslash is last character of input words */
- return WRDE_SYNTAX;
-
- case '\n':
- ++(*offset);
- break;
-
- default:
- *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
- if (*word == NULL)
- return WRDE_NOSPACE;
-
- ++(*offset);
- break;
- }
-
- return 0;
-}
-
-static int
-parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset)
-{
- /* We are poised _at_ a backslash, inside quotes */
-
- switch (words[1 + *offset])
- {
- case 0:
- /* Backslash is last character of input words */
- return WRDE_SYNTAX;
-
- case '\n':
- ++(*offset);
- break;
-
- case '$':
- case '`':
- case '"':
- case '\\':
- *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
- if (*word == NULL)
- return WRDE_NOSPACE;
-
- ++(*offset);
- break;
-
- default:
- *word = w_addchar (*word, word_length, max_length, words[*offset]);
- if (*word != NULL)
- *word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
-
- if (*word == NULL)
- return WRDE_NOSPACE;
-
- ++(*offset);
- break;
- }
-
- return 0;
-}
-
-static int
-parse_tilde (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, size_t wordc)
-{
- /* We are poised _at_ a tilde */
- size_t i;
-
- if (*word_length != 0)
- {
- if (!((*word)[*word_length - 1] == '=' && wordc == 0))
- {
- if (!((*word)[*word_length - 1] == ':'
- && strchr (*word, '=') && wordc == 0))
- {
- *word = w_addchar (*word, word_length, max_length, '~');
- return *word ? 0 : WRDE_NOSPACE;
- }
- }
- }
-
- for (i = 1 + *offset; words[i]; i++)
- {
- if (words[i] == ':' || words[i] == '/' || words[i] == ' ' ||
- words[i] == '\t' || words[i] == 0 )
- break;
-
- if (words[i] == '\\')
- {
- *word = w_addchar (*word, word_length, max_length, '~');
- return *word ? 0 : WRDE_NOSPACE;
- }
- }
-
- if (i == 1 + *offset)
- {
- /* Tilde appears on its own */
- uid_t uid;
- struct passwd pwd, *tpwd;
- int buflen = 1000;
- char* home;
- char* buffer;
- int result;
-
- /* POSIX.2 says ~ expands to $HOME and if HOME is unset the
- results are unspecified. We do a lookup on the uid if
- HOME is unset. */
-
- home = getenv ("HOME");
- if (home != NULL)
- {
- *word = w_addstr (*word, word_length, max_length, home);
- if (*word == NULL)
- return WRDE_NOSPACE;
- }
- else
- {
- uid = getuid ();
- buffer = alloca (buflen);
-
- while ((result = getpwuid_r (uid, &pwd, buffer, buflen, &tpwd)) != 0
- && errno == ERANGE)
- {
- buflen += 1000;
- buffer = alloca (buflen);
- }
-
- if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL)
- {
- *word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
- if (*word == NULL)
- return WRDE_NOSPACE;
- }
- else
- {
- *word = w_addchar (*word, word_length, max_length, '~');
- if (*word == NULL)
- return WRDE_NOSPACE;
- }
- }
- }
- else
- {
- /* Look up user name in database to get home directory */
- char *user = strndup (&words[1 + *offset], i - (1 + *offset));
- struct passwd pwd, *tpwd;
- int buflen = 1000;
- char* buffer = alloca (buflen);
- int result;
-
- while ((result = getpwnam_r (user, &pwd, buffer, buflen, &tpwd)) != 0
- && errno == ERANGE)
- {
- buflen += 1000;
- buffer = alloca (buflen);
- }
-
- if (result == 0 && tpwd != NULL && pwd.pw_dir)
- *word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
- else
- {
- /* (invalid login name) */
- *word = w_addchar (*word, word_length, max_length, '~');
- if (*word != NULL)
- *word = w_addstr (*word, word_length, max_length, user);
- }
-
- *offset = i - 1;
- }
- return *word ? 0 : WRDE_NOSPACE;
-}
-
-
-static int
-do_parse_glob (const char *glob_word, char **word, size_t *word_length,
- size_t *max_length, wordexp_t *pwordexp, const char *ifs,
- const char *ifs_white)
-{
- int error;
- int match;
- glob_t globbuf;
-
- error = glob (glob_word, GLOB_NOCHECK, NULL, &globbuf);
-
- if (error != 0)
- {
- /* We can only run into memory problems. */
- assert (error == GLOB_NOSPACE);
- return WRDE_NOSPACE;
- }
-
- if (ifs && !*ifs)
- {
- /* No field splitting allowed. */
- assert (globbuf.gl_pathv[0] != NULL);
- *word = w_addstr (*word, word_length, max_length, globbuf.gl_pathv[0]);
- for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match)
- {
- *word = w_addchar (*word, word_length, max_length, ' ');
- if (*word != NULL)
- *word = w_addstr (*word, word_length, max_length,
- globbuf.gl_pathv[match]);
- }
-
- globfree (&globbuf);
- return *word ? 0 : WRDE_NOSPACE;
- }
-
- assert (ifs == NULL || *ifs != '\0');
- if (*word != NULL)
- {
- free (*word);
- *word = w_newword (word_length, max_length);
- }
-
- for (match = 0; match < globbuf.gl_pathc; ++match)
- {
- char *matching_word = strdup (globbuf.gl_pathv[match]);
- if (matching_word == NULL || w_addword (pwordexp, matching_word))
- {
- globfree (&globbuf);
- return WRDE_NOSPACE;
- }
- }
-
- globfree (&globbuf);
- return 0;
-}
-
-static int
-parse_glob (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, int flags,
- wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
-{
- /* We are poised just after a '*', a '[' or a '?'. */
- int error = WRDE_NOSPACE;
- int quoted = 0; /* 1 if singly-quoted, 2 if doubly */
- int i;
- wordexp_t glob_list; /* List of words to glob */
-
- glob_list.we_wordc = 0;
- glob_list.we_wordv = NULL;
- glob_list.we_offs = 0;
- for (; words[*offset] != '\0'; ++*offset)
- {
- if ((ifs && strchr (ifs, words[*offset])) ||
- (!ifs && strchr (" \t\n", words[*offset])))
- /* Reached IFS */
- break;
-
- /* Sort out quoting */
- if (words[*offset] == '\'')
- {
- if (quoted == 0)
- {
- quoted = 1;
- continue;
- }
- else if (quoted == 1)
- {
- quoted = 0;
- continue;
- }
- }
- else if (words[*offset] == '"')
- {
- if (quoted == 0)
- {
- quoted = 2;
- continue;
- }
- else if (quoted == 2)
- {
- quoted = 0;
- continue;
- }
- }
-
- /* Sort out other special characters */
- if (quoted != 1 && words[*offset] == '$')
- {
- error = parse_dollars (word, word_length, max_length, words,
- offset, flags, &glob_list, ifs, ifs_white,
- quoted == 2);
- if (error)
- goto tidy_up;
-
- continue;
- }
- else if (words[*offset] == '\\')
- {
- if (quoted)
- error = parse_qtd_backslash (word, word_length, max_length,
- words, offset);
- else
- error = parse_backslash (word, word_length, max_length,
- words, offset);
-
- if (error)
- goto tidy_up;
-
- continue;
- }
-
- *word = w_addchar (*word, word_length, max_length, words[*offset]);
- if (*word == NULL)
- goto tidy_up;
- }
-
- /* Don't forget to re-parse the character we stopped at. */
- --*offset;
-
- /* Glob the words */
- error = w_addword (&glob_list, *word);
- *word = w_newword (word_length, max_length);
- for (i = 0; error == 0 && i < glob_list.we_wordc; i++)
- error = do_parse_glob (glob_list.we_wordv[i], word, word_length,
- max_length, pwordexp, ifs, ifs_white);
-
- /* Now tidy up */
-tidy_up:
- wordfree (&glob_list);
- return error;
-}
-
-static int
-parse_squote (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset)
-{
- /* We are poised just after a single quote */
- for (; words[*offset]; ++(*offset))
- {
- if (words[*offset] != '\'')
- {
- *word = w_addchar (*word, word_length, max_length, words[*offset]);
- if (*word == NULL)
- return WRDE_NOSPACE;
- }
- else return 0;
- }
-
- /* Unterminated string */
- return WRDE_SYNTAX;
-}
-
-/* Functions to evaluate an arithmetic expression */
-static int
-eval_expr_val (char **expr, long int *result)
-{
- int sgn = +1;
- char *digit;
-
- /* Skip white space */
- for (digit = *expr; digit && *digit && isspace (*digit); ++digit);
-
- switch (*digit)
- {
- case '(':
-
- /* Scan for closing paren */
- for (++digit; **expr && **expr != ')'; ++(*expr));
-
- /* Is there one? */
- if (!**expr)
- return WRDE_SYNTAX;
-
- *(*expr)++ = 0;
-
- if (eval_expr (digit, result))
- return WRDE_SYNTAX;
-
- return 0;
-
- case '+': /* Positive value */
- ++digit;
- break;
-
- case '-': /* Negative value */
- ++digit;
- sgn = -1;
- break;
-
- default:
- if (!isdigit (*digit))
- return WRDE_SYNTAX;
- }
-
- *result = 0;
- for (; *digit && isdigit (*digit); ++digit)
- *result = (*result * 10) + (*digit - '0');
-
- *expr = digit;
- *result *= sgn;
- return 0;
-}
-
-static int
-eval_expr_multdiv (char **expr, long int *result)
-{
- long int arg;
-
- /* Read a Value */
- if (eval_expr_val (expr, result) != 0)
- return WRDE_SYNTAX;
-
- while (**expr)
- {
- /* Skip white space */
- for (; *expr && **expr && isspace (**expr); ++(*expr));
-
- if (**expr == '*')
- {
- ++(*expr);
- if (eval_expr_val (expr, &arg) != 0)
- return WRDE_SYNTAX;
-
- *result *= arg;
- }
- else if (**expr == '/')
- {
- ++(*expr);
- if (eval_expr_val (expr, &arg) != 0)
- return WRDE_SYNTAX;
-
- *result /= arg;
- }
- else break;
- }
-
- return 0;
-}
-
-static int
-eval_expr (char *expr, long int *result)
-{
- long int arg;
-
- /* Read a Multdiv */
- if (eval_expr_multdiv (&expr, result) != 0)
- return WRDE_SYNTAX;
-
- while (*expr)
- {
- /* Skip white space */
- for (; expr && *expr && isspace (*expr); ++expr);
-
- if (*expr == '+')
- {
- ++expr;
- if (eval_expr_multdiv (&expr, &arg) != 0)
- return WRDE_SYNTAX;
-
- *result += arg;
- }
- else if (*expr == '-')
- {
- ++expr;
- if (eval_expr_multdiv (&expr, &arg) != 0)
- return WRDE_SYNTAX;
-
- *result -= arg;
- }
- else break;
- }
-
- return 0;
-}
-
-static int
-parse_arith (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, int flags, int bracket)
-{
- /* We are poised just after "$((" or "$[" */
- int error;
- int paren_depth = 1;
- size_t expr_length;
- size_t expr_maxlen;
- char *expr;
-
- expr = w_newword (&expr_length, &expr_maxlen);
- for (; words[*offset]; ++(*offset))
- {
- switch (words[*offset])
- {
- case '$':
- error = parse_dollars (&expr, &expr_length, &expr_maxlen,
- words, offset, flags, NULL, NULL, NULL, 1);
- /* The ``1'' here is to tell parse_dollars not to
- * split the fields.
- */
- if (error)
- {
- free (expr);
- return error;
- }
- break;
-
- case '`':
- (*offset)++;
- error = parse_backtick (&expr, &expr_length, &expr_maxlen,
- words, offset, flags, NULL, NULL, NULL);
- /* The first NULL here is to tell parse_backtick not to
- * split the fields.
- */
- if (error)
- {
- free (expr);
- return error;
- }
- break;
-
- case '\\':
- error = parse_qtd_backslash (&expr, &expr_length, &expr_maxlen,
- words, offset);
- if (error)
- {
- free (expr);
- return error;
- }
- /* I think that a backslash within an
- * arithmetic expansion is bound to
- * cause an error sooner or later anyway though.
- */
- break;
-
- case ')':
- if (--paren_depth == 0)
- {
- char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
- long int numresult = 0;
- long long int convertme;
-
- if (bracket || words[1 + *offset] != ')')
- {
- free (expr);
- return WRDE_SYNTAX;
- }
-
- ++(*offset);
-
- /* Go - evaluate. */
- if (*expr && eval_expr (expr, &numresult) != 0)
- {
- free (expr);
- return WRDE_SYNTAX;
- }
-
- if (numresult < 0)
- {
- convertme = -numresult;
- *word = w_addchar (*word, word_length, max_length, '-');
- if (!*word)
- {
- free (expr);
- return WRDE_NOSPACE;
- }
- }
- else
- convertme = numresult;
-
- result[20] = '\0';
- *word = w_addstr (*word, word_length, max_length,
- itoa (convertme, &result[20], 10, 0));
- free (expr);
- return *word ? 0 : WRDE_NOSPACE;
- }
- expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
- if (expr == NULL)
- return WRDE_NOSPACE;
-
- break;
-
- case ']':
- if (bracket && paren_depth == 1)
- {
- char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
- long int numresult = 0;
-
- /* Go - evaluate. */
- if (*expr && eval_expr (expr, &numresult) != 0)
- {
- free (expr);
- return WRDE_SYNTAX;
- }
-
- result[20] = '\0';
- *word = w_addstr (*word, word_length, max_length,
- itoa_word (numresult, &result[20], 10, 0));
- free (expr);
- return *word ? 0 : WRDE_NOSPACE;
- }
-
- free (expr);
- return WRDE_SYNTAX;
-
- case '\n':
- case ';':
- case '{':
- case '}':
- free (expr);
- return WRDE_BADCHAR;
-
- case '(':
- ++paren_depth;
- default:
- expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
- if (expr == NULL)
- return WRDE_NOSPACE;
- }
- }
-
- /* Premature end */
- free (expr);
- return WRDE_SYNTAX;
-}
-
-/* Function called by child process in exec_comm() */
-static void
-exec_comm_child (char *comm, int *fildes, int showerr, int noexec)
-{
- const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL };
-
- /* Execute the command, or just check syntax? */
- if (noexec)
- args[1] = "-nc";
-
- /* Redirect output. */
- dup2 (fildes[1], 1);
- close (fildes[1]);
-
- /* Redirect stderr to /dev/null if we have to. */
- if (showerr == 0)
- {
- int fd;
- close (2);
- fd = open (_PATH_DEVNULL, O_WRONLY);
- if (fd >= 0 && fd != 2)
- {
- dup2 (fd, 2);
- close (fd);
- }
- }
-
- /* Make sure the subshell doesn't field-split on our behalf. */
- unsetenv ("IFS");
-
- close (fildes[0]);
- execve (_PATH_BSHELL, (char *const *) args, __environ);
-
- /* Bad. What now? */
- abort ();
-}
-
-/* Function to execute a command and retrieve the results */
-/* pwordexp contains NULL if field-splitting is forbidden */
-static int
-exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length,
- int flags, wordexp_t *pwordexp, const char *ifs,
- const char *ifs_white)
-{
- int fildes[2];
- int bufsize = 128;
- int buflen;
- int i;
- int status = 0;
- size_t maxnewlines = 0;
- char *buffer;
- pid_t pid;
-
- /* Don't fork() unless necessary */
- if (!comm || !*comm)
- return 0;
-
- if (pipe (fildes))
- /* Bad */
- return WRDE_NOSPACE;
-
- if ((pid = fork ()) < 0)
- {
- /* Bad */
- close (fildes[0]);
- close (fildes[1]);
- return WRDE_NOSPACE;
- }
-
- if (pid == 0)
- exec_comm_child(comm, fildes, (flags & WRDE_SHOWERR), 0);
-
- /* Parent */
-
- close (fildes[1]);
- buffer = alloca (bufsize);
-
- if (!pwordexp)
- /* Quoted - no field splitting */
- {
- while (1)
- {
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
- {
- if (waitpid (pid, &status, WNOHANG) == 0)
- continue;
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
- break;
- }
-
- maxnewlines += buflen;
-
- *word = w_addmem (*word, word_length, max_length, buffer, buflen);
- if (*word == NULL)
- goto no_space;
- }
- }
- else
- /* Not quoted - split fields */
- {
- int copying = 0;
- /* 'copying' is:
- * 0 when searching for first character in a field not IFS white space
- * 1 when copying the text of a field
- * 2 when searching for possible non-whitespace IFS
- * 3 when searching for non-newline after copying field
- */
-
- while (1)
- {
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
- {
- if (waitpid (pid, &status, WNOHANG) == 0)
- continue;
- if ((buflen = __read (fildes[0], buffer, bufsize)) < 1)
- break;
- }
-
- for (i = 0; i < buflen; ++i)
- {
- if (strchr (ifs, buffer[i]) != NULL)
- {
- /* Current character is IFS */
- if (strchr (ifs_white, buffer[i]) == NULL)
- {
- /* Current character is IFS but not whitespace */
- if (copying == 2)
- {
- /* current character
- * |
- * V
- * eg: text<space><comma><space>moretext
- *
- * So, strip whitespace IFS (like at the start)
- */
- copying = 0;
- continue;
- }
-
- copying = 0;
- /* fall through and delimit field.. */
- }
- else
- {
- if (buffer[i] == '\n')
- {
- /* Current character is (IFS) newline */
-
- /* If copying a field, this is the end of it,
- but maybe all that's left is trailing newlines.
- So start searching for a non-newline. */
- if (copying == 1)
- copying = 3;
-
- continue;
- }
- else
- {
- /* Current character is IFS white space, but
- not a newline */
-
- /* If not either copying a field or searching
- for non-newline after a field, ignore it */
- if (copying != 1 && copying != 3)
- continue;
-
- /* End of field (search for non-ws IFS afterwards) */
- copying = 2;
- }
- }
-
- /* First IFS white space (non-newline), or IFS non-whitespace.
- * Delimit the field. Nulls are converted by w_addword. */
- if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
- goto no_space;
-
- *word = w_newword (word_length, max_length);
-
- maxnewlines = 0;
- /* fall back round the loop.. */
- }
- else
- {
- /* Not IFS character */
-
- if (copying == 3)
- {
- /* Nothing but (IFS) newlines since the last field,
- so delimit it here before starting new word */
- if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
- goto no_space;
-
- *word = w_newword (word_length, max_length);
- }
-
- copying = 1;
-
- if (buffer[i] == '\n') /* happens if newline not in IFS */
- maxnewlines++;
- else
- maxnewlines = 0;
-
- *word = w_addchar (*word, word_length, max_length,
- buffer[i]);
- if (*word == NULL)
- goto no_space;
- }
- }
- }
- }
-
- /* Chop off trailing newlines (required by POSIX.2) */
- /* Ensure we don't go back further than the beginning of the
- substitution (i.e. remove maxnewlines bytes at most) */
- while (maxnewlines-- != 0 &&
- *word_length > 0 && (*word)[*word_length - 1] == '\n')
- {
- (*word)[--*word_length] = '\0';
-
- /* If the last word was entirely newlines, turn it into a new word
- * which can be ignored if there's nothing following it. */
- if (*word_length == 0)
- {
- free (*word);
- *word = w_newword (word_length, max_length);
- break;
- }
- }
-
- close (fildes[0]);
-
- /* Check for syntax error (re-execute but with "-n" flag) */
- if (buflen < 1 && status != 0)
- {
- if ((pid = fork ()) < 0)
- {
- /* Bad */
- return WRDE_NOSPACE;
- }
-
- if (pid == 0)
- {
- fildes[0] = fildes[1] = -1;
- exec_comm_child(comm, fildes, 0, 1);
- }
-
- if (waitpid (pid, &status, 0) == pid && status != 0)
- return WRDE_SYNTAX;
- }
-
- return 0;
-
-no_space:
- kill (pid, SIGKILL);
- waitpid (pid, NULL, 0);
- close (fildes[0]);
- return WRDE_NOSPACE;
-}
-
-static int
-parse_comm (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
- const char *ifs, const char *ifs_white)
-{
- /* We are poised just after "$(" */
- int paren_depth = 1;
- int error = 0;
- int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
- size_t comm_length;
- size_t comm_maxlen;
- char *comm = w_newword (&comm_length, &comm_maxlen);
-
- for (; words[*offset]; ++(*offset))
- {
- switch (words[*offset])
- {
- case '\'':
- if (quoted == 0)
- quoted = 1;
- else if (quoted == 1)
- quoted = 0;
-
- break;
-
- case '"':
- if (quoted == 0)
- quoted = 2;
- else if (quoted == 2)
- quoted = 0;
-
- break;
-
- case ')':
- if (!quoted && --paren_depth == 0)
- {
- /* Go -- give script to the shell */
- if (comm)
- {
- error = exec_comm (comm, word, word_length, max_length,
- flags, pwordexp, ifs, ifs_white);
- free (comm);
- }
-
- return error;
- }
-
- /* This is just part of the script */
- break;
-
- case '(':
- if (!quoted)
- ++paren_depth;
- }
-
- comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
- if (comm == NULL)
- return WRDE_NOSPACE;
- }
-
- /* Premature end */
- if (comm)
- free (comm);
-
- return WRDE_SYNTAX;
-}
-
-static int
-parse_param (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
- const char *ifs, const char *ifs_white, int quoted)
-{
- /* We are poised just after "$" */
- enum action
- {
- ACT_NONE,
- ACT_RP_SHORT_LEFT = '#',
- ACT_RP_LONG_LEFT = 'L',
- ACT_RP_SHORT_RIGHT = '%',
- ACT_RP_LONG_RIGHT = 'R',
- ACT_NULL_ERROR = '?',
- ACT_NULL_SUBST = '-',
- ACT_NONNULL_SUBST = '+',
- ACT_NULL_ASSIGN = '='
- };
- size_t env_length;
- size_t env_maxlen;
- size_t pat_length;
- size_t pat_maxlen;
- size_t start = *offset;
- char *env;
- char *pattern;
- char *value = NULL;
- enum action action = ACT_NONE;
- int depth = 0;
- int colon_seen = 0;
- int seen_hash = 0;
- int free_value = 0;
- int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
- int error;
- int special = 0;
- char buffer[21];
- int brace = words[*offset] == '{';
-
- env = w_newword (&env_length, &env_maxlen);
- pattern = w_newword (&pat_length, &pat_maxlen);
-
- if (brace)
- ++*offset;
-
- /* First collect the parameter name. */
-
- if (words[*offset] == '#')
- {
- seen_hash = 1;
- if (!brace)
- goto envsubst;
- ++*offset;
- }
-
- if (isalpha (words[*offset]) || words[*offset] == '_')
- {
- /* Normal parameter name. */
- do
- {
- env = w_addchar (env, &env_length, &env_maxlen,
- words[*offset]);
- if (env == NULL)
- goto no_space;
- }
- while (isalnum (words[++*offset]) || words[*offset] == '_');
- }
- else if (isdigit (words[*offset]))
- {
- /* Numeric parameter name. */
- special = 1;
- do
- {
- env = w_addchar (env, &env_length, &env_maxlen,
- words[*offset]);
- if (env == NULL)
- goto no_space;
- if (!brace)
- goto envsubst;
- }
- while (isdigit(words[++*offset]));
- }
- else if (strchr ("*@$", words[*offset]) != NULL)
- {
- /* Special parameter. */
- special = 1;
- env = w_addchar (env, &env_length, &env_maxlen,
- words[*offset]);
- if (env == NULL)
- goto no_space;
- ++*offset;
- }
- else
- {
- if (brace)
- goto syntax;
- }
-
- if (brace)
- {
- /* Check for special action to be applied to the value. */
- switch (words[*offset])
- {
- case '}':
- /* Evaluate. */
- goto envsubst;
-
- case '#':
- action = ACT_RP_SHORT_LEFT;
- if (words[1 + *offset] == '#')
- {
- ++*offset;
- action = ACT_RP_LONG_LEFT;
- }
- break;
-
- case '%':
- action = ACT_RP_SHORT_RIGHT;
- if (words[1 + *offset] == '%')
- {
- ++*offset;
- action = ACT_RP_LONG_RIGHT;
- }
- break;
-
- case ':':
- if (strchr ("-=?+", words[1 + *offset]) == NULL)
- goto syntax;
-
- colon_seen = 1;
- action = words[++*offset];
- break;
-
- case '-':
- case '=':
- case '?':
- case '+':
- action = words[*offset];
- break;
-
- default:
- goto syntax;
- }
-
- /* Now collect the pattern, but don't expand it yet. */
- ++*offset;
- for (; words[*offset]; ++(*offset))
- {
- switch (words[*offset])
- {
- case '{':
- if (!pattern_is_quoted)
- ++depth;
- break;
-
- case '}':
- if (!pattern_is_quoted)
- {
- if (depth == 0)
- goto envsubst;
- --depth;
- }
- break;
-
- case '\\':
- if (pattern_is_quoted)
- /* Quoted; treat as normal character. */
- break;
-
- /* Otherwise, it's an escape: next character is literal. */
- if (words[++*offset] == '\0')
- goto syntax;
-
- pattern = w_addchar (pattern, &pat_length, &pat_maxlen, '\\');
- if (pattern == NULL)
- goto no_space;
-
- break;
-
- case '\'':
- if (pattern_is_quoted == 0)
- pattern_is_quoted = 1;
- else if (pattern_is_quoted == 1)
- pattern_is_quoted = 0;
-
- break;
-
- case '"':
- if (pattern_is_quoted == 0)
- pattern_is_quoted = 2;
- else if (pattern_is_quoted == 2)
- pattern_is_quoted = 0;
-
- break;
- }
-
- pattern = w_addchar (pattern, &pat_length, &pat_maxlen,
- words[*offset]);
- if (pattern == NULL)
- goto no_space;
- }
- }
-
- /* End of input string -- remember to reparse the character that we
- * stopped at. */
- --(*offset);
-
-envsubst:
- if (words[start] == '{' && words[*offset] != '}')
- goto syntax;
-
- if (env == NULL)
- {
- if (seen_hash)
- {
- /* $# expands to the number of positional parameters */
- buffer[20] = '\0';
- value = itoa_word (__libc_argc - 1, &buffer[20], 10, 0);
- seen_hash = 0;
- }
- else
- {
- /* Just $ on its own */
- *offset = start - 1;
- *word = w_addchar (*word, word_length, max_length, '$');
- return *word ? 0 : WRDE_NOSPACE;
- }
- }
- /* Is it a numeric parameter? */
- else if (isdigit (env[0]))
- {
- int n = atoi (env);
-
- if (n >= __libc_argc)
- /* Substitute NULL. */
- value = NULL;
- else
- /* Replace with appropriate positional parameter. */
- value = __libc_argv[n];
- }
- /* Is it a special parameter? */
- else if (special)
- {
- /* Is it `$$'? */
- if (*env == '$')
- {
- buffer[20] = '\0';
- value = itoa_word (__getpid (), &buffer[20], 10, 0);
- }
- /* Is it `${#*}' or `${#@}'? */
- else if ((*env == '*' || *env == '@') && seen_hash)
- {
- buffer[20] = '\0';
- value = itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0,
- &buffer[20], 10, 0);
- *word = w_addstr (*word, word_length, max_length, value);
- free (env);
- if (pattern)
- free (pattern);
- return *word ? 0 : WRDE_NOSPACE;
- }
- /* Is it `$*' or `$@' (unquoted) ? */
- else if (*env == '*' || (*env == '@' && !quoted))
- {
- size_t plist_len = 0;
- int p;
- char *end;
-
- /* Build up value parameter by parameter (copy them) */
- for (p = 1; __libc_argv[p]; ++p)
- plist_len += strlen (__libc_argv[p]) + 1; /* for space */
- value = malloc (plist_len);
- if (value == NULL)
- goto no_space;
- end = value;
- *end = 0;
- for (p = 1; __libc_argv[p]; ++p)
- {
- if (p > 1)
- *end++ = ' ';
- end = __stpcpy (end, __libc_argv[p]);
- }
-
- free_value = 1;
- }
- else
- {
- /* Must be a quoted `$@' */
- assert (*env == '@' && quoted);
-
- /* Each parameter is a separate word ("$@") */
- if (__libc_argc == 2)
- value = __libc_argv[1];
- else if (__libc_argc > 2)
- {
- int p;
-
- /* Append first parameter to current word. */
- value = w_addstr (*word, word_length, max_length,
- __libc_argv[1]);
- if (value == NULL || w_addword (pwordexp, value))
- goto no_space;
-
- for (p = 2; __libc_argv[p + 1]; p++)
- {
- char *newword = strdup (__libc_argv[p]);
- if (newword == NULL || w_addword (pwordexp, newword))
- goto no_space;
- }
-
- /* Start a new word with the last parameter. */
- *word = w_newword (word_length, max_length);
- value = __libc_argv[p];
- }
- else
- {
- free (env);
- free (pattern);
- return 0;
- }
- }
- }
- else
- value = getenv (env);
-
- if (value == NULL && (flags & WRDE_UNDEF))
- {
- /* Variable not defined. */
- error = WRDE_BADVAL;
- goto do_error;
- }
-
- if (action != ACT_NONE)
- {
- int expand_pattern = 0;
-
- /* First, find out if we need to expand pattern (i.e. if we will
- * use it). */
- switch (action)
- {
- case ACT_RP_SHORT_LEFT:
- case ACT_RP_LONG_LEFT:
- case ACT_RP_SHORT_RIGHT:
- case ACT_RP_LONG_RIGHT:
- /* Always expand for these. */
- expand_pattern = 1;
- break;
-
- case ACT_NULL_ERROR:
- case ACT_NULL_SUBST:
- case ACT_NULL_ASSIGN:
- if (!value || (!*value && colon_seen))
- /* If param is unset, or set but null and a colon has been seen,
- the expansion of the pattern will be needed. */
- expand_pattern = 1;
-
- break;
-
- case ACT_NONNULL_SUBST:
- /* Expansion of word will be needed if parameter is set and not null,
- or set null but no colon has been seen. */
- if (value && (*value || !colon_seen))
- expand_pattern = 1;
-
- break;
-
- default:
- assert (! "Unrecognised action!");
- }
-
- if (expand_pattern)
- {
- /* We need to perform tilde expansion, parameter expansion,
- command substitution, and arithmetic expansion. We also
- have to be a bit careful with wildcard characters, as
- pattern might be given to fnmatch soon. To do this, we
- convert quotes to escapes. */
-
- char *expanded;
- size_t exp_len;
- size_t exp_maxl;
- char *p;
- int quoted = 0; /* 1: single quotes; 2: double */
-
- expanded = w_newword (&exp_len, &exp_maxl);
- for (p = pattern; p && *p; p++)
- {
- size_t offset;
-
- switch (*p)
- {
- case '"':
- if (quoted == 2)
- quoted = 0;
- else if (quoted == 0)
- quoted = 2;
- else break;
-
- continue;
-
- case '\'':
- if (quoted == 1)
- quoted = 0;
- else if (quoted == 0)
- quoted = 1;
- else break;
-
- continue;
-
- case '*':
- case '?':
- if (quoted)
- {
- /* Convert quoted wildchar to escaped wildchar. */
- expanded = w_addchar (expanded, &exp_len,
- &exp_maxl, '\\');
-
- if (expanded == NULL)
- goto no_space;
- }
- break;
-
- case '$':
- offset = 0;
- error = parse_dollars (&expanded, &exp_len, &exp_maxl, p,
- &offset, flags, NULL, NULL, NULL, 1);
- if (error)
- {
- if (free_value)
- free (value);
-
- if (expanded)
- free (expanded);
-
- goto do_error;
- }
-
- p += offset;
- continue;
-
- case '~':
- if (quoted || exp_len)
- break;
-
- offset = 0;
- error = parse_tilde (&expanded, &exp_len, &exp_maxl, p,
- &offset, 0);
- if (error)
- {
- if (free_value)
- free (value);
-
- if (expanded)
- free (expanded);
-
- goto do_error;
- }
-
- p += offset;
- continue;
-
- case '\\':
- expanded = w_addchar (expanded, &exp_len, &exp_maxl, '\\');
- ++p;
- assert (*p); /* checked when extracted initially */
- if (expanded == NULL)
- goto no_space;
- }
-
- expanded = w_addchar (expanded, &exp_len, &exp_maxl, *p);
-
- if (expanded == NULL)
- goto no_space;
- }
-
- if (pattern)
- free (pattern);
-
- pattern = expanded;
- }
-
- switch (action)
- {
- case ACT_RP_SHORT_LEFT:
- case ACT_RP_LONG_LEFT:
- case ACT_RP_SHORT_RIGHT:
- case ACT_RP_LONG_RIGHT:
- {
- char *p;
- char c;
- char *end;
-
- if (value == NULL || pattern == NULL || *pattern == '\0')
- break;
-
- end = value + strlen (value);
-
- switch (action)
- {
- case ACT_RP_SHORT_LEFT:
- for (p = value; p <= end; ++p)
- {
- c = *p;
- *p = '\0';
- if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
- {
- *p = c;
- if (free_value)
- {
- char *newval = strdup (p);
- if (newval == NULL)
- {
- free (value);
- goto no_space;
- }
- free (value);
- value = newval;
- }
- else
- value = p;
- break;
- }
- *p = c;
- }
-
- break;
-
- case ACT_RP_LONG_LEFT:
- for (p = end; p >= value; --p)
- {
- c = *p;
- *p = '\0';
- if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
- {
- *p = c;
- if (free_value)
- {
- char *newval = strdup (p);
- if (newval == NULL)
- {
- free (value);
- goto no_space;
- }
- free (value);
- value = newval;
- }
- else
- value = p;
- break;
- }
- *p = c;
- }
-
- break;
-
- case ACT_RP_SHORT_RIGHT:
- for (p = end; p >= value; --p)
- {
- if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
- {
- char *newval;
- newval = malloc (p - value + 1);
-
- if (newval == NULL)
- {
- if (free_value)
- free (value);
- goto no_space;
- }
-
- *(char *) mempcpy (newval, value, p - value) = '\0';
- if (free_value)
- free (value);
- value = newval;
- free_value = 1;
- break;
- }
- }
-
- break;
-
- case ACT_RP_LONG_RIGHT:
- for (p = value; p <= end; ++p)
- {
- if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
- {
- char *newval;
- newval = malloc (p - value + 1);
-
- if (newval == NULL)
- {
- if (free_value)
- free (value);
- goto no_space;
- }
-
- *(char *) mempcpy (newval, value, p - value) = '\0';
- if (free_value)
- free (value);
- value = newval;
- free_value = 1;
- break;
- }
- }
-
- break;
-
- default:
- break;
- }
-
- break;
- }
-
- case ACT_NULL_ERROR:
- if (value && *value)
- /* Substitute parameter */
- break;
-
- error = 0;
- if (!colon_seen && value)
- /* Substitute NULL */
- ;
- else if (*pattern)
- fprintf (stderr, "%s: %s\n", env, pattern);
- else
- {
- fprintf (stderr, "%s: parameter null or not set\n", env);
- error = WRDE_BADVAL;
- }
-
- if (free_value)
- free (value);
- goto do_error;
-
- case ACT_NULL_SUBST:
- if (value && *value)
- /* Substitute parameter */
- break;
-
- if (free_value && value)
- free (value);
-
- if (!colon_seen && value)
- /* Substitute NULL */
- goto success;
-
- value = pattern ? strdup (pattern) : pattern;
- free_value = 1;
-
- if (pattern && !value)
- goto no_space;
-
- break;
-
- case ACT_NONNULL_SUBST:
- if (value && (*value || !colon_seen))
- {
- if (free_value && value)
- free (value);
-
- value = pattern ? strdup (pattern) : pattern;
- free_value = 1;
-
- if (pattern && !value)
- goto no_space;
-
- break;
- }
-
- /* Substitute NULL */
- if (free_value)
- free (value);
- goto success;
-
- case ACT_NULL_ASSIGN:
- if (value && *value)
- /* Substitute parameter */
- break;
-
- if (!colon_seen && value)
- {
- /* Substitute NULL */
- if (free_value)
- free (value);
- goto success;
- }
-
- if (free_value && value)
- free (value);
-
- value = pattern ? strdup (pattern) : pattern;
- free_value = 1;
-
- if (pattern && !value)
- goto no_space;
-
- setenv (env, value, 1);
- break;
-
- default:
- assert (! "Unrecognised action!");
- }
- }
-
- free (env); env = NULL;
- free (pattern); pattern = NULL;
-
- if (seen_hash)
- {
- char param_length[21];
- param_length[20] = '\0';
- *word = w_addstr (*word, word_length, max_length,
- itoa_word (value ? strlen (value) : 0,
- ¶m_length[20], 10, 0));
- if (free_value)
- {
- assert (value != NULL);
- free (value);
- }
-
- return *word ? 0 : WRDE_NOSPACE;
- }
-
- if (value == NULL)
- return 0;
-
- if (quoted || !pwordexp)
- {
- /* Quoted - no field split */
- *word = w_addstr (*word, word_length, max_length, value);
- if (free_value)
- free (value);
-
- return *word ? 0 : WRDE_NOSPACE;
- }
- else
- {
- /* Need to field-split */
- char *value_copy = strdup (value); /* Don't modify value */
- char *field_begin = value_copy;
- int seen_nonws_ifs = 0;
-
- if (free_value)
- free (value);
-
- if (value_copy == NULL)
- goto no_space;
-
- do
- {
- char *field_end = field_begin;
- char *next_field;
-
- /* If this isn't the first field, start a new word */
- if (field_begin != value_copy)
- {
- if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
- {
- free (value_copy);
- goto no_space;
- }
-
- *word = w_newword (word_length, max_length);
- }
-
- /* Skip IFS whitespace before the field */
- field_begin += strspn (field_begin, ifs_white);
-
- if (!seen_nonws_ifs && *field_begin == 0)
- /* Nothing but whitespace */
- break;
-
- /* Search for the end of the field */
- field_end = field_begin + strcspn (field_begin, ifs);
-
- /* Set up pointer to the character after end of field and
- skip whitespace IFS after it. */
- next_field = field_end + strspn (field_end, ifs_white);
-
- /* Skip at most one non-whitespace IFS character after the field */
- seen_nonws_ifs = 0;
- if (*next_field && strchr (ifs, *next_field))
- {
- seen_nonws_ifs = 1;
- next_field++;
- }
-
- /* Null-terminate it */
- *field_end = 0;
-
- /* Tag a copy onto the current word */
- *word = w_addstr (*word, word_length, max_length, field_begin);
-
- if (*word == NULL && *field_begin != '\0')
- {
- free (value_copy);
- goto no_space;
- }
-
- field_begin = next_field;
- }
- while (seen_nonws_ifs || *field_begin);
-
- free (value_copy);
- }
-
- return 0;
-
-success:
- error = 0;
- goto do_error;
-
-no_space:
- error = WRDE_NOSPACE;
- goto do_error;
-
-syntax:
- error = WRDE_SYNTAX;
-
-do_error:
- if (env)
- free (env);
-
- if (pattern)
- free (pattern);
-
- return error;
-}
-
-static int
-parse_dollars (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, int flags,
- wordexp_t *pwordexp, const char *ifs, const char *ifs_white,
- int quoted)
-{
- /* We are poised _at_ "$" */
- switch (words[1 + *offset])
- {
- case '"':
- case '\'':
- case 0:
- *word = w_addchar (*word, word_length, max_length, '$');
- return *word ? 0 : WRDE_NOSPACE;
-
- case '(':
- if (words[2 + *offset] == '(')
- {
- /* Differentiate between $((1+3)) and $((echo);(ls)) */
- int i = 3 + *offset;
- int depth = 0;
- while (words[i] && !(depth == 0 && words[i] == ')'))
- {
- if (words[i] == '(')
- ++depth;
- else if (words[i] == ')')
- --depth;
-
- ++i;
- }
-
- if (words[i] == ')' && words[i + 1] == ')')
- {
- (*offset) += 3;
- /* Call parse_arith -- 0 is for "no brackets" */
- return parse_arith (word, word_length, max_length, words, offset,
- flags, 0);
- }
- }
-
- if (flags & WRDE_NOCMD)
- return WRDE_CMDSUB;
-
- (*offset) += 2;
- return parse_comm (word, word_length, max_length, words, offset, flags,
- quoted? NULL : pwordexp, ifs, ifs_white);
-
- case '[':
- (*offset) += 2;
- /* Call parse_arith -- 1 is for "brackets" */
- return parse_arith (word, word_length, max_length, words, offset, flags,
- 1);
-
- case '{':
- default:
- ++(*offset); /* parse_param needs to know if "{" is there */
- return parse_param (word, word_length, max_length, words, offset, flags,
- pwordexp, ifs, ifs_white, quoted);
- }
-}
-
-static int
-parse_backtick (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, int flags,
- wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
-{
- /* We are poised just after "`" */
- int error;
- int squoting = 0;
- size_t comm_length;
- size_t comm_maxlen;
- char *comm = w_newword (&comm_length, &comm_maxlen);
-
- for (; words[*offset]; ++(*offset))
- {
- switch (words[*offset])
- {
- case '`':
- /* Go -- give the script to the shell */
- error = exec_comm (comm, word, word_length, max_length, flags,
- pwordexp, ifs, ifs_white);
- free (comm);
- return error;
-
- case '\\':
- if (squoting)
- {
- error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen,
- words, offset);
-
- if (error)
- {
- free (comm);
- return error;
- }
-
- break;
- }
-
- ++(*offset);
- error = parse_backslash (&comm, &comm_length, &comm_maxlen, words,
- offset);
-
- if (error)
- {
- free (comm);
- return error;
- }
-
- break;
-
- case '\'':
- squoting = 1 - squoting;
- default:
- comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
- if (comm == NULL)
- return WRDE_NOSPACE;
- }
- }
-
- /* Premature end */
- free (comm);
- return WRDE_SYNTAX;
-}
-
-static int
-parse_dquote (char **word, size_t *word_length, size_t *max_length,
- const char *words, size_t *offset, int flags,
- wordexp_t *pwordexp, const char * ifs, const char * ifs_white)
-{
- /* We are poised just after a double-quote */
- int error;
-
- for (; words[*offset]; ++(*offset))
- {
- switch (words[*offset])
- {
- case '"':
- return 0;
-
- case '$':
- error = parse_dollars (word, word_length, max_length, words, offset,
- flags, pwordexp, ifs, ifs_white, 1);
- /* The ``1'' here is to tell parse_dollars not to
- * split the fields. It may need to, however ("$@").
- */
- if (error)
- return error;
-
- break;
-
- case '`':
- if (flags & WRDE_NOCMD)
- return WRDE_CMDSUB;
-
- ++(*offset);
- error = parse_backtick (word, word_length, max_length, words,
- offset, flags, NULL, NULL, NULL);
- /* The first NULL here is to tell parse_backtick not to
- * split the fields.
- */
- if (error)
- return error;
-
- break;
-
- case '\\':
- error = parse_qtd_backslash (word, word_length, max_length, words,
- offset);
-
- if (error)
- return error;
-
- break;
-
- default:
- *word = w_addchar (*word, word_length, max_length, words[*offset]);
- if (*word == NULL)
- return WRDE_NOSPACE;
- }
- }
-
- /* Unterminated string */
- return WRDE_SYNTAX;
-}
-
-/*
- * wordfree() is to be called after pwordexp is finished with.
- */
-
-void
-wordfree (wordexp_t *pwordexp)
-{
-
- /* wordexp can set pwordexp to NULL */
- if (pwordexp && pwordexp->we_wordv)
- {
- char **wordv = pwordexp->we_wordv;
-
- for (wordv += pwordexp->we_offs; *wordv; ++wordv)
- free (*wordv);
-
- free (pwordexp->we_wordv);
- pwordexp->we_wordv = NULL;
- }
-}
-
-/*
- * wordexp()
- */
-
-int
-wordexp (const char *words, wordexp_t *pwordexp, int flags)
-{
- size_t words_offset;
- size_t word_length;
- size_t max_length;
- char *word = w_newword (&word_length, &max_length);
- int error;
- char *ifs;
- char ifs_white[4];
- wordexp_t old_word = *pwordexp;
-
- if (flags & WRDE_REUSE)
- {
- /* Minimal implementation of WRDE_REUSE for now */
- wordfree (pwordexp);
- old_word.we_wordv = NULL;
- }
-
- if ((flags & WRDE_APPEND) == 0)
- {
- pwordexp->we_wordc = 0;
-
- if (flags & WRDE_DOOFFS)
- {
- pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *));
- if (pwordexp->we_wordv == NULL)
- {
- error = WRDE_NOSPACE;
- goto do_error;
- }
- }
- else
- {
- pwordexp->we_wordv = calloc (1, sizeof (char *));
- if (pwordexp->we_wordv == NULL)
- {
- error = WRDE_NOSPACE;
- goto do_error;
- }
-
- pwordexp->we_offs = 0;
- }
- }
-
- /* Find out what the field separators are.
- * There are two types: whitespace and non-whitespace.
- */
- ifs = getenv ("IFS");
-
- if (!ifs)
- /* IFS unset - use <space><tab><newline>. */
- ifs = strcpy (ifs_white, " \t\n");
- else
- {
- char *ifsch = ifs;
- char *whch = ifs_white;
-
- /* Start off with no whitespace IFS characters */
- ifs_white[0] = '\0';
-
- while (*ifsch != '\0')
- {
- if ((*ifsch == ' ') || (*ifsch == '\t') || (*ifsch == '\n'))
- {
- /* Whitespace IFS. See first whether it is already in our
- collection. */
- char *runp = ifs_white;
-
- while (runp < whch && *runp != '\0' && *runp != *ifsch)
- ++runp;
-
- if (runp == whch)
- *whch++ = *ifsch;
- }
-
- ++ifsch;
- }
- *whch = '\0';
- }
-
- for (words_offset = 0 ; words[words_offset] ; ++words_offset)
- switch (words[words_offset])
- {
- case '\\':
- error = parse_backslash (&word, &word_length, &max_length, words,
- &words_offset);
-
- if (error)
- goto do_error;
-
- break;
-
- case '$':
- error = parse_dollars (&word, &word_length, &max_length, words,
- &words_offset, flags, pwordexp, ifs, ifs_white,
- 0);
-
- if (error)
- goto do_error;
-
- break;
-
- case '`':
- if (flags & WRDE_NOCMD)
- {
- error = WRDE_CMDSUB;
- goto do_error;
- }
-
- ++words_offset;
- error = parse_backtick (&word, &word_length, &max_length, words,
- &words_offset, flags, pwordexp, ifs,
- ifs_white);
-
- if (error)
- goto do_error;
-
- break;
-
- case '"':
- ++words_offset;
- error = parse_dquote (&word, &word_length, &max_length, words,
- &words_offset, flags, pwordexp, ifs, ifs_white);
-
- if (error)
- goto do_error;
-
- if (!word_length)
- {
- error = w_addword (pwordexp, NULL);
-
- if (error)
- return error;
- }
-
- break;
-
- case '\'':
- ++words_offset;
- error = parse_squote (&word, &word_length, &max_length, words,
- &words_offset);
-
- if (error)
- goto do_error;
-
- if (!word_length)
- {
- error = w_addword (pwordexp, NULL);
-
- if (error)
- return error;
- }
-
- break;
-
- case '~':
- error = parse_tilde (&word, &word_length, &max_length, words,
- &words_offset, pwordexp->we_wordc);
-
- if (error)
- goto do_error;
-
- break;
-
- case '*':
- case '[':
- case '?':
- error = parse_glob (&word, &word_length, &max_length, words,
- &words_offset, flags, pwordexp, ifs, ifs_white);
-
- if (error)
- goto do_error;
-
- break;
-
- default:
- /* Is it a word separator? */
- if (strchr (" \t", words[words_offset]) == NULL)
- {
- char ch = words[words_offset];
-
- /* Not a word separator -- but is it a valid word char? */
- if (strchr ("\n|&;<>(){}", ch))
- {
- /* Fail */
- error = WRDE_BADCHAR;
- goto do_error;
- }
-
- /* "Ordinary" character -- add it to word */
- word = w_addchar (word, &word_length, &max_length,
- ch);
- if (word == NULL)
- {
- error = WRDE_NOSPACE;
- goto do_error;
- }
-
- break;
- }
-
- /* If a word has been delimited, add it to the list. */
- if (word != NULL)
- {
- error = w_addword (pwordexp, word);
- if (error)
- goto do_error;
- }
-
- word = w_newword (&word_length, &max_length);
- }
-
- /* End of string */
-
- /* There was a word separator at the end */
- if (word == NULL) /* i.e. w_newword */
- return 0;
-
- /* There was no field separator at the end */
- return w_addword (pwordexp, word);
-
-do_error:
- /* Error:
- * free memory used (unless error is WRDE_NOSPACE), and
- * set pwordexp members back to what they were.
- */
-
- if (word != NULL)
- free (word);
-
- if (error == WRDE_NOSPACE)
- return WRDE_NOSPACE;
-
- if ((flags & WRDE_APPEND) == 0)
- wordfree (pwordexp);
-
- *pwordexp = old_word;
- return error;
-}
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