projects / wasi-libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 320054e8 DG |
1 | #include <stdlib.h> |
| 2 | #include <string.h> | |
| 3 | #include <unistd.h> | |
| 4 | #include <errno.h> | |
| 5 | #include <limits.h> | |
| 6 | ||
| 7 | extern char **__environ; | |
| 8 | ||
| 9 | int __execvpe(const char *file, char *const argv[], char *const envp[]) | |
| 10 | { | |
| 11 | const char *p, *z, *path = getenv("PATH"); | |
| 12 | size_t l, k; | |
| 13 | int seen_eacces = 0; | |
| 14 | ||
| 15 | errno = ENOENT; | |
| 16 | if (!*file) return -1; | |
| 17 | ||
| 18 | if (strchr(file, '/')) | |
| 19 | return execve(file, argv, envp); | |
| 20 | ||
| 21 | if (!path) path = "/usr/local/bin:/bin:/usr/bin"; | |
| 22 | k = strnlen(file, NAME_MAX+1); | |
| 23 | if (k > NAME_MAX) { | |
| 24 | errno = ENAMETOOLONG; | |
| 25 | return -1; | |
| 26 | } | |
| 27 | l = strnlen(path, PATH_MAX-1)+1; | |
| 28 | ||
| 29 | for(p=path; ; p=z) { | |
| 30 | char b[l+k+1]; | |
| f41256b6 | 31 | z = __strchrnul(p, ':'); |
| 320054e8 DG |
32 | if (z-p >= l) { |
| 33 | if (!*z++) break; | |
| 34 | continue; | |
| 35 | } | |
| 36 | memcpy(b, p, z-p); | |
| 37 | b[z-p] = '/'; | |
| 38 | memcpy(b+(z-p)+(z>p), file, k+1); | |
| 39 | execve(b, argv, envp); | |
| 40 | switch (errno) { | |
| 41 | case EACCES: | |
| 42 | seen_eacces = 1; | |
| 43 | case ENOENT: | |
| 44 | case ENOTDIR: | |
| 45 | break; | |
| 46 | default: | |
| 47 | return -1; | |
| 48 | } | |
| 49 | if (!*z++) break; | |
| 50 | } | |
| 51 | if (seen_eacces) errno = EACCES; | |
| 52 | return -1; | |
| 53 | } | |
| 54 | ||
| 55 | int execvp(const char *file, char *const argv[]) | |
| 56 | { | |
| 57 | return __execvpe(file, argv, __environ); | |
| 58 | } | |
| 59 | ||
| 60 | weak_alias(__execvpe, execvpe); |