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detab.c
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/****************************************************************************
* tools/detab.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define LINE_SIZE 1024
/****************************************************************************
* Private Data
****************************************************************************/
static char g_line[LINE_SIZE];
/****************************************************************************
* Public Functions
****************************************************************************/
int main(int argc, char **argv, char **envp)
{
FILE *instream;
FILE *outstream;
const char *infile;
const char *outfile;
int tabsize = 8;
int tabmask = 7;
int newpos;
int pos;
int ret = 1;
int i;
if (argc == 3)
{
infile = argv[1];
outfile = argv[2];
}
else if (argc == 4)
{
if (strcmp(argv[1], "-4") != 0)
{
fprintf(stderr, "ERROR: Unrecognized option\n");
fprintf(stderr, "Usage: %s [-4] <source-file> <out-file>\n",
argv[0]);
return 1;
}
tabsize = 4;
tabmask = 3;
infile = argv[2];
outfile = argv[3];
}
else
{
fprintf(stderr, "ERROR: At least two arguments expected\n");
fprintf(stderr, "Usage: %s [-4] <source-file> <out-file>\n", argv[0]);
return 1;
}
/* Open the source file read-only */
instream = fopen(infile, "r");
if (instream == NULL)
{
fprintf(stderr, "ERROR: Failed to open %s for reading\n", argv[1]);
return 1;
}
/* Open the destination file write-only */
outstream = fopen(outfile, "w");
if (outstream == NULL)
{
fprintf(stderr, "ERROR: Failed to open %s for reading\n", argv[2]);
goto errout_with_instream;
}
while (fgets(g_line, LINE_SIZE, instream) != NULL)
{
for (pos = 0, i = 0; i < LINE_SIZE && g_line[i] != '\0'; i++)
{
if (g_line[i] == '\t')
{
newpos = (pos + tabsize) & ~tabmask;
for (; pos < newpos; pos++)
{
fputc(' ', outstream);
}
}
else
{
fputc(g_line[i], outstream);
pos++;
}
}
}
ret = 0;
fclose(outstream);
errout_with_instream:
fclose(instream);
return ret;
}