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#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);
}
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