diff options
Diffstat (limited to 'gl/read-file.c')
-rw-r--r-- | gl/read-file.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/gl/read-file.c b/gl/read-file.c deleted file mode 100644 index 2418053..0000000 --- a/gl/read-file.c +++ /dev/null @@ -1,188 +0,0 @@ -/* read-file.c -- read file contents into a string - Copyright (C) 2006, 2009-2017 Free Software Foundation, Inc. - Written by Simon Josefsson and Bruno Haible. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3, or (at your option) - any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, see <http://www.gnu.org/licenses/>. */ - -#include <config.h> - -#include "read-file.h" - -/* Get fstat. */ -#include <sys/stat.h> - -/* Get ftello. */ -#include <stdio.h> - -/* Get SIZE_MAX. */ -#include <stdint.h> - -/* Get malloc, realloc, free. */ -#include <stdlib.h> - -/* Get errno. */ -#include <errno.h> - -/* Read a STREAM and return a newly allocated string with the content, - and set *LENGTH to the length of the string. The string is - zero-terminated, but the terminating zero byte is not counted in - *LENGTH. On errors, *LENGTH is undefined, errno preserves the - values set by system functions (if any), and NULL is returned. */ -char * -fread_file (FILE *stream, size_t *length) -{ - char *buf = NULL; - size_t alloc = BUFSIZ; - - /* For a regular file, allocate a buffer that has exactly the right - size. This avoids the need to do dynamic reallocations later. */ - { - struct stat st; - - if (fstat (fileno (stream), &st) >= 0 && S_ISREG (st.st_mode)) - { - off_t pos = ftello (stream); - - if (pos >= 0 && pos < st.st_size) - { - off_t alloc_off = st.st_size - pos; - - /* '1' below, accounts for the trailing NUL. */ - if (SIZE_MAX - 1 < alloc_off) - { - errno = ENOMEM; - return NULL; - } - - alloc = alloc_off + 1; - } - } - } - - if (!(buf = malloc (alloc))) - return NULL; /* errno is ENOMEM. */ - - { - size_t size = 0; /* number of bytes read so far */ - int save_errno; - - for (;;) - { - /* This reads 1 more than the size of a regular file - so that we get eof immediately. */ - size_t requested = alloc - size; - size_t count = fread (buf + size, 1, requested, stream); - size += count; - - if (count != requested) - { - save_errno = errno; - if (ferror (stream)) - break; - - /* Shrink the allocated memory if possible. */ - if (size < alloc - 1) - { - char *smaller_buf = realloc (buf, size + 1); - if (smaller_buf != NULL) - buf = smaller_buf; - } - - buf[size] = '\0'; - *length = size; - return buf; - } - - { - char *new_buf; - - if (alloc == SIZE_MAX) - { - save_errno = ENOMEM; - break; - } - - if (alloc < SIZE_MAX - alloc / 2) - alloc = alloc + alloc / 2; - else - alloc = SIZE_MAX; - - if (!(new_buf = realloc (buf, alloc))) - { - save_errno = errno; - break; - } - - buf = new_buf; - } - } - - free (buf); - errno = save_errno; - return NULL; - } -} - -static char * -internal_read_file (const char *filename, size_t *length, const char *mode) -{ - FILE *stream = fopen (filename, mode); - char *out; - int save_errno; - - if (!stream) - return NULL; - - out = fread_file (stream, length); - - save_errno = errno; - - if (fclose (stream) != 0) - { - if (out) - { - save_errno = errno; - free (out); - } - errno = save_errno; - return NULL; - } - - return out; -} - -/* Open and read the contents of FILENAME, and return a newly - allocated string with the content, and set *LENGTH to the length of - the string. The string is zero-terminated, but the terminating - zero byte is not counted in *LENGTH. On errors, *LENGTH is - undefined, errno preserves the values set by system functions (if - any), and NULL is returned. */ -char * -read_file (const char *filename, size_t *length) -{ - return internal_read_file (filename, length, "r"); -} - -/* Open (on non-POSIX systems, in binary mode) and read the contents - of FILENAME, and return a newly allocated string with the content, - and set LENGTH to the length of the string. The string is - zero-terminated, but the terminating zero byte is not counted in - the LENGTH variable. On errors, *LENGTH is undefined, errno - preserves the values set by system functions (if any), and NULL is - returned. */ -char * -read_binary_file (const char *filename, size_t *length) -{ - return internal_read_file (filename, length, "rb"); -} |