Mercurial > hg > octave-lyh > gnulib-hg
changeset 1843:d9e10c329845
(getugroups): Don't dereference a null pointer when
running `id USER' for some USER that is listed on the RHS in /etc/group.
From Sander van Malssen.
Add some curly braces, use STREQ, reverse the sense of a test
and use `continue' to save a level of nesting.
author | Jim Meyering <jim@meyering.net> |
---|---|
date | Sat, 15 May 1999 04:50:26 +0000 |
parents | 2a63a615fc73 |
children | b4c60bbb474a |
files | lib/getugroups.c |
diffstat | 1 files changed, 10 insertions(+), 3 deletions(-) [+] |
line wrap: on
line diff
--- a/lib/getugroups.c +++ b/lib/getugroups.c @@ -41,6 +41,8 @@ # include <strings.h> #endif +#define STREQ(s1, s2) ((strcmp (s1, s2) == 0)) + /* Like `getgroups', but for user USERNAME instead of for the current process. Store at most MAXCOUNT group IDs in the GROUPLIST array. If GID is not -1, store it first (if possible). GID should be the @@ -64,14 +66,17 @@ setgrent (); while ((grp = getgrent ()) != 0) - for (cp = grp->gr_mem; *cp; ++cp) - if (!strcmp (username, *cp)) + { + for (cp = grp->gr_mem; *cp; ++cp) { int n; + if ( ! STREQ (username, *cp)) + continue; + /* See if this group number is already on the list. */ for (n = 0; n < count; ++n) - if (grouplist[n] == grp->gr_gid) + if (grouplist && grouplist[n] == grp->gr_gid) break; /* If it's a new group number, then try to add it to the list. */ @@ -89,6 +94,8 @@ count++; } } + } endgrent (); + return count; }