1 #include <stdlib.h> 2 #include <string.h> 3 #include <stdio.h> 4 5 main(int argc, char **argv) 6 { 7 char *f, *s; 8 int n; 9 10 if(argc != 2){ 11 fprintf(stderr, "Usage: dirname string\n"); 12 exit(1); 13 } 14 s = argv[1]; 15 f = s + strlen(s) - 1; 16 while(f > s && *f == '/') 17 f--; 18 *++f = 0; 19 /* now f is after last char of string, trailing slashes removed */ 20 21 for(; f >= s; f--) 22 if(*f == '/'){ 23 f++; 24 break; 25 } 26 if(f < s) { 27 *s = '.'; 28 s[1] = 0; 29 } else { 30 --f; 31 while(f > s && *f == '/') 32 f--; 33 f[1] = 0; 34 } 35 36 printf("%s\n", s); 37 } 38