If your task is not to invent the line-by-line reading function, but just to read the file line-by-line, you may use a typical code snippet involving the getline()
function (see the manual page here):
#define _GNU_SOURCE #include <stdio.h> #include <stdlib.h> int main(void) { FILE * fp; char * line = NULL; size_t len = 0; ssize_t read; fp = fopen("/etc/motd", "r"); if (fp == NULL) exit(EXIT_FAILURE); while ((read = getline(&line, &len, fp)) != -1) { printf("Retrieved line of length %zu:\n", read); printf("%s", line); } fclose(fp); if (line) free(line); exit(EXIT_SUCCESS); }
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