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// find string in
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char **argv){
char buffer[BUFSIZ] = { 0 };
char *buf, *start;
ssize_t len = 0;
int cpy = 0;
unsigned long long pos = 0;
unsigned long long cpy_size = 0;
// get max argument length
if(argc < 2) {
printf("please supply a string to search for in stdin\n");
exit(EXIT_FAILURE);
}
unsigned int save_size = strlen(argv[1]);
cpy = save_size - 1;
cpy_size = BUFSIZ - cpy;
buf = buffer;
start = buf + cpy;
// copy our first cpy length into the first part of our buffer
len = fread(buffer, 1, cpy, stdin);
if(len == 0)
exit(EXIT_FAILURE);
// read into "start" (buf + cpy) from stdin
while((len = fread(start, 1, cpy_size, stdin)) != 0) {
char *p = buffer;
while((p = strstr(p, argv[1])) != NULL) {
printf("%llu\n", pos + (p - buffer));
p++;
}
memcpy(buffer, buffer + len, cpy);
pos = pos + len;
}
return 0;
}
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