1 /*! gcc -std=c89 -pedantic -Wall -o pwd pwd.c */

2 #include <stdio.h>

3 #include <stdlib.h>

4 #include <string.h>

5 #include <errno.h>

6 #include <unistd.h>

7

8 int main(void)

9 {

10 char *tmp, *wdbuf;

11 size_t bufsz = 64;

12

13 if(!(wdbuf = malloc(bufsz))) {

14 perror("malloc failed");

15 return 1;

16 }

17

18 while(!(tmp = getcwd(wdbuf, bufsz)) && errno == ERANGE) {

19 size_t newsz = bufsz ? bufsz * 2 : 2;

20

21 if(!(tmp = realloc(wdbuf, newsz))) {

22 fprintf(stderr, "failed to allocate: %u bytes: %s\n", (unsigned int)newsz, strerror(errno));

23 free(wdbuf);

24 return 1;

25 }

26 wdbuf = tmp;

27 bufsz = newsz;

28 }

29

30 if(!tmp) {

31 perror("getcwd failed");

32 free(wdbuf);

33 return 1;

34 }

35

36 puts(wdbuf);

37 free(wdbuf);

38 return 0;

39 }