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- /****************************************************************************
- * tools/detab.c
- *
- * Copyright (C) 2018 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * 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 OWNER 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.
- *
- ****************************************************************************/
- /****************************************************************************
- * 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;
- }
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