72 lines
3.0 KiB
C
72 lines
3.0 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/calls/struct/stat.h"
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#include "libc/errno.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/madv.h"
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#include "libc/sysv/consts/o.h"
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/**
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* Reads entire file into memory.
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*
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* @return NUL-terminated malloc'd contents, or NULL w/ errno
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* @note this is uninterruptible
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*/
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char *xslurp(const char *path, size_t *opt_out_size) {
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int fd;
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ssize_t rc;
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size_t i, got;
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char *res, *p;
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struct stat st;
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res = NULL;
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if ((fd = open(path, O_RDONLY)) != -1) {
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if (fstat(fd, &st) != -1 && (res = valloc(st.st_size))) {
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if (st.st_size > 2 * 1024 * 1024) {
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fadvise(fd, 0, st.st_size, MADV_SEQUENTIAL);
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}
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for (i = 0; i < st.st_size; i += got) {
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TryAgain:
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if ((rc = pread(fd, res + i, st.st_size - i, i)) != -1) {
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if (!(got = rc)) {
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if (fstat(fd, &st) == -1) {
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abort();
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}
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}
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} else if (errno == EINTR) {
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goto TryAgain;
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} else {
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free(res);
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res = NULL;
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break;
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}
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}
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if (res) {
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if (opt_out_size) {
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*opt_out_size = st.st_size;
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}
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res[i] = '\0';
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}
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}
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close(fd);
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}
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return res;
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}
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