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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libc/] [posix/] [execvp.c] - Rev 1775
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/* execvp.c */ /* This and the other exec*.c files in this directory require the target to provide the _execve syscall. */ #include <_ansi.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <ctype.h> #ifdef __CYGWIN32__ static char path_delim; #define PATH_DELIM path_delim #else #define PATH_DELIM ':' #endif /* * Copy string, until c or <nul> is encountered. * NUL-terminate the destination string (s1). */ static char * _DEFUN (strccpy, (s1, s2, c), char *s1 _AND char *s2 _AND char c) { char *dest = s1; while (*s2 && *s2 != c) *s1++ = *s2++; *s1 = 0; return dest; } int _DEFUN (execvp, (file, argv), _CONST char *file _AND char * _CONST argv[]) { char *path = getenv ("PATH"); char buf[MAXNAMLEN]; /* If $PATH doesn't exist, just pass FILE on unchanged. */ if (!path) return execv (file, argv); /* If FILE contains a directory, don't search $PATH. */ if (strchr (file, '/') #ifdef __CYGWIN32__ || strchr (file, '\\') #endif ) return execv (file, argv); #ifdef __CYGWIN32__ /* If a drive letter is passed, the path is still an absolute one. Technically this isn't true, but Cygwin is currently defined so that it is. */ if ((isalpha (file[0]) && file[1] == ':') || file[0] == '\\') return execv (file, argv); #endif #ifdef __CYGWIN32__ path_delim = cygwin_posix_path_list_p (path) ? ':' : ';'; #endif while (*path) { strccpy (buf, path, PATH_DELIM); /* An empty entry means the current directory. */ if (*buf != 0) strcat (buf, "/"); strcat (buf, file); if (execv (buf, argv) == -1 && errno != ENOENT) return -1; while (*path && *path != PATH_DELIM) path++; if (*path == PATH_DELIM) path++; /* skip over delim */ } return -1; }
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