95 lines
1.6 KiB
C
95 lines
1.6 KiB
C
/* Utility to change strings in binary files.
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Reads from standard input, writes on standard output.
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Only replaces one occurrence if the -s flag is given.
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*/
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#include <stdio.h>
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main(argc, argv)
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char *argv[];
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{
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register char *psrc;
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register int ch;
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int srclen;
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int sflag = 0;
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char *progname = argv[0];
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while (argc > 1 && argv[1][0] == '-') {
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switch(argv[1][1]) {
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case 's':
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sflag = 1;
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break;
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default:
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fprintf(stderr,
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"Usage: %s [-s] <originalstring> <replacementstring>\n",
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progname);
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exit(1);
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}
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argc--;
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argv++;
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}
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if (argc != 3) {
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fprintf(stderr,
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"Usage: %s [-s] <originalstring> <replacementstring>\n",
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progname);
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exit(1);
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}
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psrc = argv[1];
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srclen = strlen(psrc);
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if (srclen == 0) {
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fprintf(stderr,
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"%s: originalstring must have length > 0\n",
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progname);
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exit(1);
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}
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for (;;) {
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ch = getchar();
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if (ch == EOF) exit(0);
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if (ch != (*psrc & 0377)) {
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putchar(ch);
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continue;
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}
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do {
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psrc++;
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ch = getchar();
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} while (ch && ch == (*psrc & 0377));
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if (ch != EOF) ungetc(ch, stdin);
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if (*psrc == '\0') {
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/* we have a match */
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register int i;
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register char *prepl = argv[2];
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for (i = srclen; i; i--) {
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if (*prepl) {
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putchar(*prepl);
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prepl++;
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}
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else putchar('\0');
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}
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while (*prepl) {
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putchar(*prepl);
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prepl++;
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if (ch != EOF) ch = getchar();
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}
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if (sflag) {
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break;
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}
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}
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else {
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register char *p = argv[1];
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while (p < psrc) {
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putchar(*p);
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p++;
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}
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if (ch == EOF) exit(0);
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}
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psrc = argv[1];
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}
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if (ch == EOF) exit(0);
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while ((ch = getchar()) != EOF) {
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putchar(ch);
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}
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exit(0);
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}
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