mirror of
https://salsa.debian.org/ha-team/libqb
synced 2025-08-25 13:39:06 +00:00
144 lines
3.0 KiB
C
144 lines
3.0 KiB
C
/*
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* Copyright (C) 2013 Red Hat, Inc.
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*
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* All rights reserved.
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*
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* Author: Jan Friesse <jfriesse@redhat.com>
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*
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* libqb is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* libqb 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libqb. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <sys/types.h>
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#include <assert.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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static void usage(void)
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{
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printf("Usage: [ -i input_file] [ -o output_file ] [ -n no_bytes]\n");
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printf("Changes no_bytes (default 1024) in input_file (default = - = stdin) and store\n");
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printf("result to output_file (default = - = stdout). It's possible to use same file\n");
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printf("as both input and output\n");
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exit(1);
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}
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static void init_rand(void) {
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unsigned int init_v;
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init_v = time(NULL) + getpid();
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srand(init_v);
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}
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int main(int argc, char *argv[])
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{
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FILE *fi, *fo;
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int i;
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const char *input_file_name;
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const char *output_file_name;
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int no_bytes;
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char *ep;
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int ch;
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unsigned char *data;
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size_t data_size;
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size_t data_pos;
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size_t input_data_size;
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unsigned char buf[1024];
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input_file_name = "-";
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output_file_name = "-";
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no_bytes = 1024;
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while ((ch = getopt(argc, argv, "hi:o:n:")) != -1) {
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switch (ch) {
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case 'i':
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input_file_name = optarg;
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break;
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case 'n':
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no_bytes = strtol(optarg, &ep, 10);
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if (no_bytes < 0 || *ep != '\0') {
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warnx("illegal number -- %s", argv[2]);
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usage();
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}
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break;
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case 'o':
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output_file_name = optarg;
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break;
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case 'h':
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case '?':
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default:
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usage();
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/* NOTREACHED */
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}
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}
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if (strcmp(input_file_name, "-") == 0) {
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fi = stdin;
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} else {
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fi = fopen(input_file_name, "rb");
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if (fi == NULL) {
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err(1, "%s", input_file_name);
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}
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}
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/*
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* Open and fully read input file
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*/
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data = NULL;
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data_size = 0;
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data_pos = 0;
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while ((input_data_size = fread(buf, 1, sizeof(buf), fi)) != 0) {
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if (data_pos + input_data_size >= data_size) {
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data_size = (data_size + input_data_size) * 2;
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assert((data = realloc(data, data_size)) != NULL);
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}
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memcpy(data + data_pos, buf, input_data_size);
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data_pos += input_data_size;
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}
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fclose(fi);
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/*
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* Change bytes
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*/
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init_rand();
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for (i = 0; i < no_bytes; i++) {
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data[rand() % data_pos] = rand();
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}
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/*
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* Fully write ouput file
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*/
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if (strcmp(output_file_name, "-") == 0) {
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fo = stdout;
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} else {
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fo = fopen(output_file_name, "wb");
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if (fo == NULL) {
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err(1, "%s", output_file_name);
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}
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}
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assert(fwrite(data, 1, data_pos, fo) == data_pos);
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fclose(fo);
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free(data);
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return (0);
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}
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