diff options
author | Simon Josefsson <simon@josefsson.org> | 2006-06-12 15:39:09 +0000 |
---|---|---|
committer | Simon Josefsson <simon@josefsson.org> | 2006-06-12 15:39:09 +0000 |
commit | ce5db705284392d3236ddbd3a0875a2ae637d0e6 (patch) | |
tree | e2b84e34717967d08fbc77d5ff5bfd8264ff5a8e /gl/read-file.c | |
parent | e081bc5bd68c06d6d0d04e4ac7d95fd749a3514f (diff) | |
download | gnutls-ce5db705284392d3236ddbd3a0875a2ae637d0e6.tar.gz |
Update.
Diffstat (limited to 'gl/read-file.c')
-rw-r--r-- | gl/read-file.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/gl/read-file.c b/gl/read-file.c new file mode 100644 index 0000000000..12b2f17f4b --- /dev/null +++ b/gl/read-file.c @@ -0,0 +1,143 @@ +/* read-file.c -- read file contents into a string + Copyright (C) 2006 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 Lesser General Public License as published by + the Free Software Foundation; either version 2.1, 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 Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include "read-file.h" + +/* Get 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 = 0; + size_t size = 0; + + while (!feof (stream)) + { + size_t count; + + if (size + BUFSIZ + 1 > alloc) + { + char *new_buf; + + alloc += alloc / 2; + if (alloc < size + BUFSIZ + 1) + alloc = size + BUFSIZ + 1; + + new_buf = realloc (buf, alloc); + if (!new_buf) + { + int save_errno = errno; + free (buf); + errno = save_errno; + return NULL; + } + + buf = new_buf; + } + + count = fread (buf + size, 1, alloc - size - 1, stream); + size += count; + + if (ferror (stream)) + { + int save_errno = errno; + free (buf); + errno = save_errno; + return NULL; + } + } + + if (buf) + buf[size] = '\0'; + + *length = size; + + return buf; +} + +static char * +internal_read_file (const char *filename, size_t * length, const char *mode) +{ + FILE *stream = fopen (filename, mode); + char *out; + int rc; + + if (!stream) + return NULL; + + out = fread_file (stream, length); + + if (out) + rc = fclose (stream); + else + { + /* On failure, preserve the original errno value. */ + int save_errno = errno; + rc = fclose (stream); + errno = save_errno; + } + + if (rc != 0) + { + int 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"); +} |