sub.c

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/******************************************************************************
 *
 *  sub.c - This little utility substitutes all occurances of a string
 *      with another string.  Is this useful?  Maybe not.  But it's
 *      been here since r2 so it seems a shame to remove it :)
 *      Currently not built by build system
 *
 * $Id: sub.c 2833 2013-06-29 06:40:28Z chrislit $
 *
 * Copyright 1997-2009 CrossWire Bible Society (http://www.crosswire.org)
 *  CrossWire Bible Society
 *  P. O. Box 2528
 *  Tempe, AZ  85280-2528
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation version 2.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 */

#include <stdio.h>
#include <stdlib.h>

main(int argc, char **argv)
{
    FILE *fp;
    char *buf;
    int size;

    if ((argc < 3) || (argc > 4)) {
        fprintf(stderr, "usage: %s <string> <substitute string> [filename]\n", *argv);
        exit(-1);
    }

    if (argc > 3)
        fp = fopen(argv[3], "r");
    else    fp = stdin;

    size = strlen(argv[1]);
    buf = (char *)calloc(size + 1, 1);

    while ((buf[size - 1] = fgetc(fp)) != EOF) {
        if (!strcmp(buf, argv[1])) {
            printf("\n%s", argv[2]);
            memset(buf, 0, size);
            continue;
        }
        if (*buf) {
            printf("%c", *buf);
        }
        memmove(buf, &buf[1], size);
    }
    buf[size - 1] = 0;
    printf("%s", buf);
}