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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
extern char **__environ;
int execvp(const char *file, char *const argv[])
{
const char *p, *z, *path = getenv("PATH");
int l;
if (strchr(file, '/'))
return execve(file, argv, __environ);
/* FIXME: integer overflows */
if (!path) path = "/usr/local/bin:/bin:/usr/bin";
l = strlen(file) + strlen(path) + 2;
for(p=path; p && *p; p=z) {
char b[l];
z = strchr(p, ':');
if (z) {
memcpy(b, p, z-p);
b[z++-p] = 0;
} else strcpy(b, p);
strcat(b, "/");
strcat(b, file);
if (!access(b, X_OK))
return execve(b, argv, __environ);
}
errno = ENOENT;
return -1;
}
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