/* execvp.c */
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/* execvp.c */
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/* This and the other exec*.c files in this directory require
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/* This and the other exec*.c files in this directory require
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the target to provide the _execve syscall. */
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the target to provide the _execve syscall. */
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#include <_ansi.h>
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#include <_ansi.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <dirent.h>
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#include <string.h>
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#include <string.h>
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#include <errno.h>
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#include <errno.h>
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#include <ctype.h>
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#include <ctype.h>
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#define PATH_DELIM ':'
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#define PATH_DELIM ':'
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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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_DEFUN (strccpy, (s1, s2, c),
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_DEFUN (strccpy, (s1, s2, c),
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char *s1 _AND
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char *s1 _AND
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char *s2 _AND
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char *s2 _AND
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char c)
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char c)
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{
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{
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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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*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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_DEFUN (execvp, (file, argv),
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_DEFUN (execvp, (file, argv),
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_CONST char *file _AND
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_CONST char *file _AND
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char * _CONST argv[])
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char * _CONST argv[])
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{
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{
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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 $PATH doesn't exist, just pass FILE on unchanged. */
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/* If $PATH doesn't exist, just pass FILE on unchanged. */
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if (!path)
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if (!path)
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return execv (file, argv);
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return execv (file, argv);
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/* If FILE contains a directory, don't search $PATH. */
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/* If FILE contains a directory, don't search $PATH. */
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if (strchr (file, '/')
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if (strchr (file, '/')
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)
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)
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return execv (file, argv);
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return execv (file, argv);
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while (*path)
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while (*path)
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{
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{
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strccpy (buf, path, PATH_DELIM);
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strccpy (buf, path, PATH_DELIM);
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/* An empty entry means the current directory. */
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/* An empty entry means the current directory. */
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if (*buf != 0 && buf[strlen(buf) - 1] != '/')
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if (*buf != 0 && buf[strlen(buf) - 1] != '/')
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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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if (execv (buf, argv) == -1 && errno != ENOENT)
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if (execv (buf, argv) == -1 && errno != ENOENT)
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return -1;
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return -1;
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while (*path && *path != PATH_DELIM)
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while (*path && *path != PATH_DELIM)
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path++;
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path++;
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if (*path == PATH_DELIM)
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if (*path == PATH_DELIM)
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path++; /* skip over delim */
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path++; /* skip over delim */
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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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