186 lines
3.4 KiB
C
186 lines
3.4 KiB
C
/*
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* Copyright 2008-2013 Various Authors
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* Copyright 2005 Timo Hirvonen
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "file.h"
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#include "xmalloc.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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ssize_t read_all(int fd, void *buf, size_t count)
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{
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char *buffer = buf;
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ssize_t pos = 0;
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do {
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ssize_t rc;
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rc = read(fd, buffer + pos, count - pos);
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if (rc == -1) {
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if (errno == EINTR || errno == EAGAIN)
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continue;
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return -1;
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}
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if (rc == 0) {
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/* eof */
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break;
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}
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pos += rc;
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} while (count - pos > 0);
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return pos;
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}
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ssize_t write_all(int fd, const void *buf, size_t count)
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{
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const char *buffer = buf;
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int count_save = count;
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do {
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int rc;
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rc = write(fd, buffer, count);
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if (rc == -1) {
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if (errno == EINTR || errno == EAGAIN)
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continue;
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return -1;
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}
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buffer += rc;
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count -= rc;
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} while (count > 0);
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return count_save;
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}
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char *mmap_file(const char *filename, ssize_t *size)
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{
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struct stat st;
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char *buf;
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int fd;
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fd = open(filename, O_RDONLY);
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if (fd == -1)
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goto err;
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if (fstat(fd, &st) == -1)
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goto close_err;
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/* can't mmap empty files */
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buf = NULL;
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if (st.st_size) {
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buf = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if (buf == MAP_FAILED)
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goto close_err;
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}
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close(fd);
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*size = st.st_size;
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return buf;
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close_err:
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close(fd);
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err:
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*size = -1;
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return NULL;
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}
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void buffer_for_each_line(const char *buf, int size,
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int (*cb)(void *data, const char *line),
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void *data)
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{
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char *line = NULL;
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int line_size = 0, pos = 0;
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while (pos < size) {
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int end, len;
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end = pos;
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while (end < size && buf[end] != '\n')
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end++;
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len = end - pos;
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if (end > pos && buf[end - 1] == '\r')
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len--;
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if (len >= line_size) {
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line_size = len + 1;
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line = xrenew(char, line, line_size);
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}
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memcpy(line, buf + pos, len);
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line[len] = 0;
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pos = end + 1;
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if (cb(data, line))
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break;
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}
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free(line);
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}
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void buffer_for_each_line_reverse(const char *buf, int size,
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int (*cb)(void *data, const char *line),
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void *data)
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{
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char *line = NULL;
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int line_size = 0, end = size - 1;
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while (end >= 0) {
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int pos, len;
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if (end > 1 && buf[end] == '\n' && buf[end - 1] == '\r')
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end--;
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pos = end;
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while (pos > 0 && buf[pos - 1] != '\n')
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pos--;
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len = end - pos;
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if (len >= line_size) {
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line_size = len + 1;
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line = xrenew(char, line, line_size);
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}
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memcpy(line, buf + pos, len);
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line[len] = 0;
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end = pos - 1;
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if (cb(data, line))
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break;
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}
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free(line);
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}
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int file_for_each_line(const char *filename,
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int (*cb)(void *data, const char *line),
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void *data)
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{
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char *buf;
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ssize_t size;
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buf = mmap_file(filename, &size);
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if (size == -1)
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return -1;
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if (buf) {
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buffer_for_each_line(buf, size, cb, data);
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munmap(buf, size);
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}
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return 0;
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}
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