su: update CyanogenMod's latest version

[android-x86/system-extras.git] / su / utils.c

diff --git a/su/utils.c b/su/utils.c
new file mode 100644 (file)
index 0000000..54056e0
--- /dev/null
+++ b/su/utils.c
@@ -0,0 +1,104 @@
+/*
+** Copyright 2012, The CyanogenMod Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#include <unistd.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <endian.h>
+#include <ctype.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <cutils/properties.h>
+
+/* reads a file, making sure it is terminated with \n \0 */
+char* read_file(const char *fn, unsigned *_sz)
+{
+    char *data;
+    int sz;
+    int fd;
+
+    data = 0;
+    fd = open(fn, O_RDONLY);
+    if(fd < 0) return 0;
+
+    sz = lseek(fd, 0, SEEK_END);
+    if(sz < 0) goto oops;
+
+    if(lseek(fd, 0, SEEK_SET) != 0) goto oops;
+
+    data = (char*) malloc(sz + 2);
+    if(data == 0) goto oops;
+
+    if(read(fd, data, sz) != sz) goto oops;
+    close(fd);
+    data[sz] = '\n';
+    data[sz+1] = 0;
+    if(_sz) *_sz = sz;
+    return data;
+
+oops:
+    close(fd);
+    if(data != 0) free(data);
+    return 0;
+}
+
+int get_property(const char *data, char *found, const char *searchkey, const char *not_found)
+{
+    char *key, *value, *eol, *sol, *tmp;
+    if (data == NULL) goto defval;
+    int matched = 0;
+    sol = strdup(data);
+    while((eol = strchr(sol, '\n'))) {
+        key = sol;
+        *eol++ = 0;
+        sol = eol;
+
+        value = strchr(key, '=');
+        if(value == 0) continue;
+        *value++ = 0;
+
+        while(isspace(*key)) key++;
+        if(*key == '#') continue;
+        tmp = value - 2;
+        while((tmp > key) && isspace(*tmp)) *tmp-- = 0;
+
+        while(isspace(*value)) value++;
+        tmp = eol - 2;
+        while((tmp > value) && isspace(*tmp)) *tmp-- = 0;
+
+        if (strncmp(searchkey, key, strlen(searchkey)) == 0) {
+            matched = 1;
+            break;
+        }
+    }
+    int len;
+    if (matched) {
+        len = strlen(value);
+        if (len >= PROPERTY_VALUE_MAX)
+            return -1;
+        memcpy(found, value, len + 1);
+    } else goto defval;
+    return len;
+
+defval:
+    len = strlen(not_found);
+    memcpy(found, not_found, len + 1);
+    return len;
+}
+