1 /* 2 * fgets.c 3 * 4 * This will be very slow due to the implementation of getc(), 5 * but we can't afford to drain characters we don't need from 6 * the input. 7 */ 8 9 #include <stdio.h> 10 11 char *fgets(char *s, int n, FILE * f) 12 { 13 int ch; 14 char *p = s; 15 16 while (n > 1) { 17 ch = getc(f); 18 if (ch == EOF) { 19 *p = '\0'; 20 return (p == s) ? NULL : s; 21 } 22 *p++ = ch; 23 if (ch == '\n') 24 break; 25 n--; 26 } 27 if (n) 28 *p = '\0'; 29 30 return s; 31 } 32
