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readlink: add -m and -f flags

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This commit is contained in:
Tai Chi Minh Ralph Eastwood 2015-02-11 08:55:17 +00:00 committed by sin
parent 0fcad66c75
commit 28e26bc688
1 changed files with 54 additions and 14 deletions
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68
readlink.c
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@ -5,6 +5,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include "util.h"
@ -17,17 +18,18 @@ usage(void)
int
main(int argc, char *argv[])
{
char buf[PATH_MAX];
char buf1[PATH_MAX], buf2[PATH_MAX], arg[PATH_MAX];
int nflag = 0;
int fflag = 0;
int mefflag = 0;
ssize_t n;
struct stat st;
char *p = arg, *lp = NULL, *b = buf1;
ARGBEGIN {
case 'e':
case 'm':
eprintf("not implemented\n");
case 'e':
case 'f':
fflag = 1;
mefflag = ARGC();
break;
case 'n':
nflag = 1;
@ -42,16 +44,54 @@ main(int argc, char *argv[])
if (strlen(argv[0]) > PATH_MAX - 1)
eprintf("path too long\n");
if (fflag) {
if (!realpath(argv[0], buf))
exit(1);
} else {
if ((n = readlink(argv[0], buf, sizeof(buf) - 1)) < 0)
exit(1);
buf[n] = '\0';
#define SWAP_BUF() (b = (b == buf1 ? buf2 : buf1));
switch (mefflag) {
case 'm':
if (argv[0][0] == '/') { /* case when path is on '/' */
arg[0] = '/';
arg[1] = '\0';
p++;
} else if (!strchr(argv[0], '/')) { /* relative path */
arg[0] = '.';
arg[1] = '/';
arg[2] = '\0';
} else
arg[0] = '\0';
strncat(arg, argv[0], PATH_MAX);
while ((p = strchr(p, '/'))) {
*p = '\0';
if (!realpath(arg, b)) {
*p = '/';
goto mdone;
}
SWAP_BUF();
lp = p;
*p++ = '/';
}
if (!realpath(arg, b)) {
mdone:
SWAP_BUF();
if (lp) {
/* drop the extra '/' on root */
lp += (argv[0][0] == '/' &&
lp - arg == 1);
strncat(b, lp, PATH_MAX);
}
}
break;
case 'e':
if (stat(argv[0], &st) < 0)
exit(1);
case 'f':
if (!realpath(argv[0], b))
exit(1);
break;
default:
if ((n = readlink(argv[0], b, PATH_MAX - 1)) < 0)
exit(1);
b[n] = '\0';
}
printf("%s", buf);
printf("%s", b);
if (!nflag)
putchar('\n');