137 lines
3.6 KiB
C
137 lines
3.6 KiB
C
/* $XConsortium: readfile.c,v 1.5 94/12/11 14:25:48 gildea Exp $ */
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/*
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Copyright (c) 1988, 1991 X Consortium
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the X Consortium shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from the X Consortium.
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*/
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/* $XFree86: xc/programs/xmessage/readfile.c,v 1.2 2000/02/14 19:21:04 dawes Exp $ */
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#include <X11/Xos.h> /* for types.h */
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "readfile.h"
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/*
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* get_data_from_file - read data from a file into a single buffer; meant
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* for small files containing messages.
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*/
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static char *
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get_data_from_file (char *filename, int *len_return)
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{
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FILE *fp;
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struct stat statbuf;
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char *cp;
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int count;
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if (stat (filename, &statbuf) != 0 || statbuf.st_size < 0) {
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perror(filename);
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return NULL;
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}
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cp = malloc (statbuf.st_size + 1);
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if (!cp) {
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fprintf(stderr, "cannot get memory for message file\n");
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return NULL;
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}
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fp = fopen (filename, "r");
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if (!fp) {
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perror(filename);
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(void) free (cp);
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return NULL;
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}
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count = fread (cp, 1, statbuf.st_size, fp);
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if (count == 0 && statbuf.st_size != 0) {
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perror(filename);
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(void) free (cp);
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(void) fclose (fp);
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return NULL;
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}
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cp[count] = '\0'; /* since we allocated one extra */
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*len_return = count;
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(void) fclose (fp);
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return cp;
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}
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/*
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* get_data_from_stdin - read data from stdin into a single buffer.
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*/
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static char *
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get_data_from_stdin (int *len_return)
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{
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char *cp;
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int count;
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int allocated;
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int n;
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allocated = BUFSIZ;
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cp = malloc (allocated + 1);
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if (!cp) {
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fprintf(stderr, "cannot get memory for message file\n");
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return NULL;
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}
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count = 0;
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while ((n = fread (cp + count, 1, BUFSIZ, stdin)) > 0) {
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count += n;
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/* Here count <= allocated. Prepare for next round. */
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if (count + BUFSIZ > allocated) {
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char *oldp = cp;
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allocated = 2 * allocated;
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cp = realloc (cp, allocated + 1);
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if (!cp) {
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free(oldp);
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fprintf(stderr, "cannot get memory for message file\n");
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return NULL;
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}
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}
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}
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cp[count] = '\0'; /* since we allocated one extra */
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*len_return = count;
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return cp;
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}
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/*
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* read_file - read data from indicated file and return pointer to malloced
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* buffer. Returns NULL on error or if no such file.
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*/
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char *
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read_file (char *filename, int *len /* returned */)
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{
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if (filename[0] == '-' && filename[1] == '\0') {
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return (get_data_from_stdin (len));
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} else {
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return (get_data_from_file (filename, len));
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}
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}
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