#include <stdio.h>
#include <string.h>
#define BUF_SIZE 80

void* my_realloc( void* p, size_t bytes, int line ) {
if( (p = realloc(p, bytes)) == NULL ) {
fprintf(stderr, "realloc failure called at line %d\n", line);
exit(EXIT_FAILURE);
}
return p;
}
int main () {
FILE *fp;
char *file = "data.csv";
char buf[BUF_SIZE], input[BUF_SIZE], format[20];
char **result, *s;
int i, size = 50, count = 0;

if( (fp = fopen(file, "r")) == NULL ) {
perror(file);
exit(EXIT_FAILURE);
}
sprintf(format, "%%%ds%%*[^\n]%%*c", sizeof(input) - 1);
scanf(format, input);

result = my_realloc(NULL, sizeof(*result) * size, __LINE__);

while( (fgets(buf, sizeof buf, fp)) != NULL) {
if( strstr(buf, input) == NULL ) continue;