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Fix unportable gid_t and uid_t parsing in fgetpwent_r(3).

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Jonas 'Sortie' Termansen 2013-12-28 21:48:56 +01:00
parent ace4a6cc54
commit 7bc8ccd46f
1 changed files with 33 additions and 11 deletions
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44
libc/pwd/fgetpwent_r.cpp
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@ -49,19 +49,41 @@ static char* next_field(char** current)
return result; return result;
} }
static id_t next_field_id(char** current) static bool next_field_uintmax(char** current, uintmax_t* result)
{ {
char* id_str = next_field(current); char* id_str = next_field(current);
if ( !id_str ) if ( !id_str )
return -1; return false;
char* id_endptr; char* id_endptr;
intmax_t id_imax = strtoimax(id_str, &id_endptr, 10); uintmax_t id_umax = strtoumax(id_str, &id_endptr, 10);
if ( id_imax < 0 || *id_endptr ) if ( *id_endptr )
return -1; return false;
id_t id = (id_t) id_imax; *result = id_umax;
if ( id != id_imax ) return true;
return -1; }
return id;
static gid_t next_field_gid(char** current, gid_t* result)
{
uintmax_t id_umax;
if ( !next_field_uintmax(current, &id_umax) )
return false;
gid_t gid = (gid_t) id_umax;
if ( (uintmax_t) gid != (uintmax_t) id_umax )
return false;
*result = gid;
return true;
}
static uid_t next_field_uid(char** current, uid_t* result)
{
uintmax_t id_umax;
if ( !next_field_uintmax(current, &id_umax) )
return false;
uid_t uid = (uid_t) id_umax;
if ( (uintmax_t) uid != (uintmax_t) id_umax )
return false;
*result = uid;
return true;
} }
extern "C" extern "C"
@ -132,9 +154,9 @@ int fgetpwent_r(FILE* restrict fp,
goto parse_failure; goto parse_failure;
if ( !(result->pw_passwd = next_field(&parse_str)) ) if ( !(result->pw_passwd = next_field(&parse_str)) )
goto parse_failure; goto parse_failure;
if ( (result->pw_uid = next_field_id(&parse_str)) < 0 ) if ( !next_field_uid(&parse_str, &result->pw_uid) )
goto parse_failure; goto parse_failure;
if ( !(result->pw_gid = next_field_id(&parse_str)) < 0 ) if ( !next_field_gid(&parse_str, &result->pw_gid) )
goto parse_failure; goto parse_failure;
if ( !(result->pw_gecos = next_field(&parse_str)) ) if ( !(result->pw_gecos = next_field(&parse_str)) )
goto parse_failure; goto parse_failure;