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/*
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* author: Jerome Glisse
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[])
{
char line[256], tmp[256];
FILE **files;
unsigned i;
if (argc <= 2) {
fprintf(stderr, "%s FILES - FILES\n", argv[0]);
return -EINVAL;
}
files = malloc(sizeof(void*) * argc);
if (files == NULL) {
return -ENOMEM;
}
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "-")) {
files[i] = NULL;
continue;
}
files[i] = fopen(argv[i], "r");
if (files[i] == NULL) {
fprintf(stderr, "failed opening %s\n", argv[i]);
return -EINVAL;
}
}
do {
unsigned diff, skip;
fgets(line, 256, files[1]);
for (i = 2, diff = 0, skip = 0; i < argc; i++) {
if (files[i] == NULL) {
diff = 1;
continue;
}
if (feof(files[i])) {
return 0;
}
fgets(tmp, 256, files[i]);
if (skip) {
continue;
}
if (diff) {
if (strcmp(line, tmp)) {
printf("- %s", line);
printf("+ %s", tmp);
}
} else {
if (strcmp(line, tmp)) {
skip = 1;
}
}
}
} while (!feof(files[1]));
return 0;
}
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