#include <sys/unistd.h>
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#include <sys/unistd.h>
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#include <errno.h>
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#include <errno.h>
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extern char **environ;
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extern char **environ;
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int
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int
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execv (const char *path, char * const *args) {
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execv (const char *path, char * const *args) {
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extern int execve (const char *, char * const *, char * const*);
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extern int execve (const char *, char * const *, char * const*);
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return execve (path, args, environ);
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return execve (path, args, environ);
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}
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}
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int
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int
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execl(const char *path, const char *arg1, ...) {
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execl(const char *path, const char *arg1, ...) {
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return execv (path, &arg1);
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return execv (path, &arg1);
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}
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}
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/*
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/*
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* Copy string, until c or <nul> is encountered.
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* Copy string, until c or <nul> is encountered.
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* NUL-terminate the destination string (s1).
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* NUL-terminate the destination string (s1).
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*/
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*/
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static char *
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static char *
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strccpy (char *s1, char *s2, char c) {
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strccpy (char *s1, char *s2, char c) {
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char *dest = s1;
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char *dest = s1;
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while (*s2 && *s2 != c) {
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while (*s2 && *s2 != c) {
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*s1++ = *s2++;
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*s1++ = *s2++;
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}
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}
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*s1 = 0;
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*s1 = 0;
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return dest;
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return dest;
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}
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}
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int
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int
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execvp(const char *file, char * const *args) {
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execvp(const char *file, char * const *args) {
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extern char *getenv (const char *);
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extern char *getenv (const char *);
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char *path = getenv ("PATH");
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char *path = getenv ("PATH");
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char buf[MAXNAMLEN];
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char buf[MAXNAMLEN];
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if (file[0] == '/') { /* absolute pathname -- easy out */
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if (file[0] == '/') { /* absolute pathname -- easy out */
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return execv (file, args);
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return execv (file, args);
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}
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}
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buf[0] = 0; /* lots of initialization here 8-) */
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buf[0] = 0; /* lots of initialization here 8-) */
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while (*path) {
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while (*path) {
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strccpy (buf, path, ':');
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strccpy (buf, path, ':');
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strcat (buf, "/");
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strcat (buf, "/");
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strcat (buf, file);
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strcat (buf, file);
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execv (buf, args);
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execv (buf, args);
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if (errno != ENOENT)
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if (errno != ENOENT)
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return -1;
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return -1;
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while (*path && *path != ':')
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while (*path && *path != ':')
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path++;
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path++;
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}
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}
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return -1;
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return -1;
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}
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}
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