1b259f1ae7
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com> Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com>
144 lines
2.6 KiB
C
144 lines
2.6 KiB
C
/*
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* Copyright 2019 Intel Corporation
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* SPDX-License-Identifier: MIT
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*/
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#include "os_file.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#if defined(WIN32)
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#include <io.h>
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#define open _open
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#define fdopen _fdopen
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#define O_CREAT _O_CREAT
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#define O_EXCL _O_EXCL
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#define O_WRONLY _O_WRONLY
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#endif
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FILE *
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os_file_create_unique(const char *filename, int filemode)
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{
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int fd = open(filename, O_CREAT | O_EXCL | O_WRONLY, filemode);
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if (fd == -1)
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return NULL;
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return fdopen(fd, "w");
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}
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#if defined(__linux__)
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static ssize_t
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readN(int fd, char *buf, size_t len)
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{
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int err = -ENODATA;
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size_t total = 0;
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do {
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ssize_t ret = read(fd, buf + total, len - total);
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if (ret < 0)
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ret = -errno;
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if (ret == -EINTR || ret == -EAGAIN)
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continue;
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if (ret <= 0) {
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err = ret;
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break;
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}
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total += ret;
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} while (total != len);
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return total ? (ssize_t)total : err;
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}
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char *
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os_read_file(const char *filename)
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{
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/* Note that this also serves as a slight margin to avoid a 2x grow when
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* the file is just a few bytes larger when we read it than when we
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* fstat'ed it.
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* The string's NULL terminator is also included in here.
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*/
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size_t len = 64;
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int fd = open(filename, O_RDONLY);
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if (fd == -1) {
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/* errno set by open() */
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return NULL;
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}
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/* Pre-allocate a buffer at least the size of the file if we can read
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* that information.
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*/
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struct stat stat;
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if (fstat(fd, &stat) == 0)
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len += stat.st_size;
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char *buf = malloc(len);
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if (!buf) {
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close(fd);
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errno = -ENOMEM;
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return NULL;
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}
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ssize_t actually_read;
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size_t offset = 0, remaining = len - 1;
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while ((actually_read = readN(fd, buf + offset, remaining)) == (ssize_t)remaining) {
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char *newbuf = realloc(buf, 2 * len);
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if (!newbuf) {
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free(buf);
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close(fd);
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errno = -ENOMEM;
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return NULL;
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}
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buf = newbuf;
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len *= 2;
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offset += actually_read;
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remaining = len - offset - 1;
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}
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close(fd);
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if (actually_read > 0)
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offset += actually_read;
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/* Final resize to actual size */
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len = offset + 1;
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char *newbuf = realloc(buf, len);
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if (!newbuf) {
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free(buf);
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close(fd);
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errno = -ENOMEM;
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return NULL;
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}
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buf = newbuf;
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buf[offset] = '\0';
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return buf;
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}
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#else
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char *
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os_read_file(const char *filename)
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{
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errno = -ENOSYS;
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return NULL;
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}
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#endif
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