diff options
Diffstat (limited to 'grp')
| -rw-r--r-- | grp/fgetgrent.c | 48 | ||||
| -rw-r--r-- | grp/fgetgrent_r.c | 15 |
2 files changed, 56 insertions, 7 deletions
diff --git a/grp/fgetgrent.c b/grp/fgetgrent.c index 9873ba1b61..0b461ad5fe 100644 --- a/grp/fgetgrent.c +++ b/grp/fgetgrent.c @@ -16,20 +16,60 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <errno.h> #include <grp.h> -#include <stdio.h> +#include <libc-lock.h> +#include <stdlib.h> +/* We need to protect the dynamic buffer handling. */ +__libc_lock_define_initialized (static, lock); + /* Read one entry from the given stream. */ struct group * fgetgrent (FILE *stream) { - static char buffer[BUFSIZ]; + static char *buffer; + static size_t buffer_size; static struct group resbuf; struct group *result; + int save; + + /* Get lock. */ + __libc_lock_lock (lock); + + /* Allocate buffer if not yet available. */ + if (buffer == NULL) + { + buffer_size = NSS_BUFLEN_GROUP; + buffer = malloc (buffer_size); + } + + while (buffer != NULL + && __fgetgrent_r (stream, &resbuf, buffer, buffer_size, &result) != 0 + && errno == ERANGE) + { + char *new_buf; + buffer_size += NSS_BUFLEN_GROUP; + new_buf = realloc (buffer, buffer_size); + if (new_buf == NULL) + { + /* We are out of memory. Free the current buffer so that the + process gets a chance for a normal termination. */ + save = errno; + free (buffer); + __set_errno (save); + } + buffer = new_buf; + } + + if (buffer == NULL) + result = NULL; - if (__fgetgrent_r (stream, &resbuf, buffer, sizeof buffer, &result) != 0) - return NULL; + /* Release lock. Preserve error value. */ + save = errno; + __libc_lock_unlock (lock); + __set_errno (save); return result; } diff --git a/grp/fgetgrent_r.c b/grp/fgetgrent_r.c index dd74cfcd70..44298c5ba6 100644 --- a/grp/fgetgrent_r.c +++ b/grp/fgetgrent_r.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 1996 Free Software Foundation, Inc. +/* Copyright (C) 1991, 1996, 1997 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -56,6 +56,7 @@ __fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen, struct group **result) { char *p; + int parse_result; do { @@ -69,10 +70,18 @@ __fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen, /* Skip leading blanks. */ while (isspace (*p)) ++p; - } while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */ + } while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */ /* Parse the line. If it is invalid, loop to get the next line of the file to parse. */ - ! parse_line (p, resbuf, (void *) buffer, buflen)); + || ! (parse_result = parse_line (p, resbuf, + (void *) buffer, buflen))); + + if (parse_result == -1) + { + /* The parser ran out of space. */ + *result = NULL; + return errno; + } *result = resbuf; return 0; |