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85d9219a62
The idea is to provide a more or less drop in replacement for readline to read from zlib/gzip streams. Take the opportunity to replace malloc with talloc.
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* zlib-extra.c - Extra or enhanced routines for compressed I/O.
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*
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* Copyright (c) 2014 David Bremner
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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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* Author: David Bremner <david@tethera.net>
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*/
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#include "zlib-extra.h"
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#include <talloc.h>
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#include <stdio.h>
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#include <string.h>
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/* mimic POSIX/glibc getline, but on a zlib gzFile stream, and using talloc */
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util_status_t
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gz_getline (void *talloc_ctx, char **bufptr, ssize_t *bytes_read, gzFile stream)
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{
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char *buf = *bufptr;
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unsigned int len;
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size_t offset = 0;
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if (buf) {
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len = talloc_array_length (buf);
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} else {
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/* same as getdelim from gnulib */
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len = 120;
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buf = talloc_array (talloc_ctx, char, len);
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if (buf == NULL)
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return UTIL_OUT_OF_MEMORY;
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}
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while (1) {
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if (! gzgets (stream, buf + offset, len - offset)) {
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/* Null indicates EOF or error */
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int zlib_status = 0;
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(void) gzerror (stream, &zlib_status);
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switch (zlib_status) {
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case Z_OK:
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/* no data read before EOF */
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if (offset == 0)
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return UTIL_EOF;
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else
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goto SUCCESS;
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case Z_ERRNO:
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return UTIL_ERRNO;
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default:
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return UTIL_GZERROR;
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}
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}
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offset += strlen (buf + offset);
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if (buf[offset - 1] == '\n')
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goto SUCCESS;
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len *= 2;
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buf = talloc_realloc (talloc_ctx, buf, char, len);
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if (buf == NULL)
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return UTIL_OUT_OF_MEMORY;
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}
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SUCCESS:
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*bufptr = buf;
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*bytes_read = offset;
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return UTIL_SUCCESS;
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}
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const char *gz_error_string (util_status_t status, gzFile file)
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{
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if (status == UTIL_GZERROR)
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return gzerror (file, NULL);
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else
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return util_error_string (status);
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}
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