From 33d1439fdbf56ec100dbddfa9f7472a0da59d183 Mon Sep 17 00:00:00 2001
From: Peter Stephenson
Date: Fri, 2 Jan 2015 21:32:51 +0000
Subject: users/19667: whence -S shows intermediate steps in symlink expansion
---
Src/utils.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 60 insertions(+), 7 deletions(-)
(limited to 'Src/utils.c')
diff --git a/Src/utils.c b/Src/utils.c
index 893a8ca02..2b2a815a8 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -719,7 +719,7 @@ slashsplit(char *s)
/**/
static int
-xsymlinks(char *s)
+xsymlinks(char *s, int full)
{
char **pp, **opp;
char xbuf2[PATH_MAX*3], xbuf3[PATH_MAX*2];
@@ -758,14 +758,49 @@ xsymlinks(char *s)
} else {
ret = 1;
metafy(xbuf3, t0, META_NOALLOC);
+ if (!full) {
+ /*
+ * If only one expansion requested, ensure the
+ * full path is in xbuf.
+ */
+ zulong len = xbuflen;
+ if (*xbuf3 == '/')
+ strcpy(xbuf, xbuf3);
+ else if ((len += strlen(xbuf3) + 1) < sizeof(xbuf)) {
+ strcpy(xbuf + xbuflen, "/");
+ strcpy(xbuf + xbuflen + 1, xbuf3);
+ } else {
+ *xbuf = 0;
+ ret = -1;
+ break;
+ }
+
+ while (*++pp) {
+ zulong newlen = len + strlen(*pp) + 1;
+ if (newlen < sizeof(xbuf)) {
+ strcpy(xbuf + len, "/");
+ strcpy(xbuf + len + 1, *pp);
+ len = newlen;
+ } else {
+ *xbuf = 01;
+ ret = -1;
+ break;
+ }
+ }
+ /*
+ * No need to update xbuflen, we're finished
+ * the expansion (for now).
+ */
+ break;
+ }
if (*xbuf3 == '/') {
strcpy(xbuf, "");
- if (xsymlinks(xbuf3 + 1) < 0)
+ if (xsymlinks(xbuf3 + 1, 0) < 0)
ret = -1;
else
xbuflen = strlen(xbuf);
} else
- if (xsymlinks(xbuf3) < 0)
+ if (xsymlinks(xbuf3, 0) < 0)
ret = -1;
else
xbuflen = strlen(xbuf);
@@ -787,7 +822,7 @@ xsymlink(char *s)
if (*s != '/')
return NULL;
*xbuf = '\0';
- if (xsymlinks(s + 1) < 0)
+ if (xsymlinks(s + 1, 1) < 0)
zwarn("path expansion failed, using root directory");
if (!*xbuf)
return ztrdup("/");
@@ -796,12 +831,30 @@ xsymlink(char *s)
/**/
void
-print_if_link(char *s)
+print_if_link(char *s, int all)
{
if (*s == '/') {
*xbuf = '\0';
- if (xsymlinks(s + 1) > 0)
- printf(" -> "), zputs(*xbuf ? xbuf : "/", stdout);
+ if (all) {
+ char *start = s + 1;
+ char xbuflink[PATH_MAX];
+ for (;;) {
+ if (xsymlinks(start, 0) > 0) {
+ printf(" -> ");
+ zputs(*xbuf ? xbuf : "/", stdout);
+ if (!*xbuf)
+ break;
+ strcpy(xbuflink, xbuf);
+ start = xbuflink + 1;
+ *xbuf = '\0';
+ } else {
+ break;
+ }
+ }
+ } else {
+ if (xsymlinks(s + 1, 1) > 0)
+ printf(" -> "), zputs(*xbuf ? xbuf : "/", stdout);
+ }
}
}
--
cgit 1.4.1