From: Eric Andersen <andersen@codepoet.org>
Date: Wed, 18 Apr 2001 22:00:20 +0000 (-0000)
Subject: Posix 1003.13 POSIX_MULTI_PROCESS specifies that execle() should
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=99a6ee4b85e3be653e2801f61d171763e1fa6015;p=uclinux-h8%2FuClibc.git

Posix 1003.13 POSIX_MULTI_PROCESS specifies that execle() should
be there, so I just wrote it up.
 -Erik
---

diff --git a/libc/unistd/execle.c b/libc/unistd/execle.c
new file mode 100644
index 000000000..14c7a0bfc
--- /dev/null
+++ b/libc/unistd/execle.c
@@ -0,0 +1,53 @@
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdarg.h>
+
+extern int execvep(const char *path, char *const argv[], char *const envp[]);
+
+int execle(const char *file, const char *arg, ...)
+{
+	const char *shortargv[16];
+	const char **argv;
+	const char *c;
+	int i;
+	va_list args;
+	const char *const *envp;
+
+	i = 1;
+
+	va_start(args, arg);
+
+	do {
+		c = va_arg(args, const char *);
+
+		i++;
+	} while (c);
+
+	va_end(args);
+
+	if (i <= 16)
+		argv = shortargv;
+	else {
+		argv = (const char **) alloca(sizeof(char *) * i);
+	}
+
+	argv[0] = arg;
+	i = 1;
+
+	va_start(args, arg);
+
+	do {
+		argv[i] = va_arg(args, const char *);
+	} while (argv[i++]);
+
+	envp = va_arg (args, const char *const *);
+	va_end(args);
+
+	i = execvep(file, (char *const *) argv, (char *const *) envp);
+
+	if (argv != shortargv)
+		free(argv);
+
+	return i;
+}