mirror of
https://github.com/jart/cosmopolitan.git
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0d748ad58e
This change fixes Cosmopolitan so it has fewer opinions about compiler warnings. The whole repository had to be cleaned up to be buildable in -Werror -Wall mode. This lets us benefit from things like strict const checking. Some actual bugs might have been caught too.
76 lines
3.3 KiB
C
76 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/mem/alloca.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Executes program, with PATH search and current environment.
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*
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* The current process is replaced with the executed one.
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*
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* @param prog is program to launch (may be PATH searched)
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* @param arg[0] is the name of the program to run
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* @param arg[1,n-2] optionally specify program arguments
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* @param arg[n-1] is NULL
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* @return doesn't return on success, otherwise -1 w/ errno
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* @asyncsignalsafe
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* @vforksafe
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*/
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int execlp(const char *prog, const char *arg, ... /*, NULL*/) {
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int i;
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char *exe;
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char **argv;
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va_list va, vb;
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char pathbuf[PATH_MAX];
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// turn varargs into array
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va_copy(vb, va);
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va_start(va, arg);
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for (i = 0; va_arg(va, const char *); ++i) (void)0;
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va_end(va);
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argv = alloca((i + 2) * sizeof(char *));
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va_start(vb, arg);
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argv[0] = (char *)arg;
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for (i = 1;; ++i) {
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if (!(argv[i] = va_arg(vb, char *))) break;
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}
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va_end(vb);
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if (strchr(prog, '/')) {
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return execv(prog, argv);
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}
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// resolve path of executable
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if (!(exe = commandv(prog, pathbuf, sizeof(pathbuf)))) {
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return -1;
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}
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// change argv[0] to resolved path if it's ambiguous
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// otherwise the program won't have much luck finding itself
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if (argv[0] && *prog != '/' && *exe == '/' && !strcmp(prog, argv[0])) {
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argv[0] = exe;
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}
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// execute program
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// tail call shouldn't be possible
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return execv(exe, argv);
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}
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