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Larry suggested using concat_path_file() would be an even safer bet

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for 'which'.  I ageed, so I whipped this up -- which revealed a bug in
concat_path_file.  It turns out that that a '/' can be appended from
either the path _or_ the filename, but only the former was checked.
 -Erik
This commit is contained in:
Eric Andersen 2001-05-04 22:04:24 +00:00
parent a0ba9f45fb
commit 044a72d0d5
3 changed files with 9 additions and 9 deletions
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7
findutils/which.c
View File

@ -53,10 +53,9 @@ extern int which_main(int argc, char **argv)
argv++; argv++;
found = 0; found = 0;
for (i = 0; i < count; i++) { for (i = 0; i < count; i++) {
char buf[strlen(path_n)+strlen(*argv)+2]; char *buf;
strcpy (buf, path_n); buf = concat_path_file(buf, path_n);
strcat (buf, "/"); buf = concat_path_file(buf, *argv);
strcat (buf, *argv);
if (stat (buf, &filestat) == 0 if (stat (buf, &filestat) == 0
&& filestat.st_mode & S_IXUSR) && filestat.st_mode & S_IXUSR)
{ {

4
libbb/concat_path_file.c
View File

@ -15,9 +15,11 @@ extern char *concat_path_file(const char *path, const char *filename)
int flg_slash = 1; int flg_slash = 1;
l = strlen(path); l = strlen(path);
if(l>0 && path[l-1] == '/') if (l>0 && path[l-1] == '/')
flg_slash--; flg_slash--;
l += strlen(filename); l += strlen(filename);
if (l>0 && filename[0] == '/')
flg_slash--;
outbuf = xmalloc(l+1+flg_slash); outbuf = xmalloc(l+1+flg_slash);
sprintf(outbuf, (flg_slash ? "%s/%s" : "%s%s"), path, filename); sprintf(outbuf, (flg_slash ? "%s/%s" : "%s%s"), path, filename);
return outbuf; return outbuf;

7
which.c
View File

@ -53,10 +53,9 @@ extern int which_main(int argc, char **argv)
argv++; argv++;
found = 0; found = 0;
for (i = 0; i < count; i++) { for (i = 0; i < count; i++) {
char buf[strlen(path_n)+strlen(*argv)+2]; char *buf;
strcpy (buf, path_n); buf = concat_path_file(buf, path_n);
strcat (buf, "/"); buf = concat_path_file(buf, *argv);
strcat (buf, *argv);
if (stat (buf, &filestat) == 0 if (stat (buf, &filestat) == 0
&& filestat.st_mode & S_IXUSR) && filestat.st_mode & S_IXUSR)
{ {