/* * __getspent_r.c - Based on __getpwent_r.c * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the Free * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <stdlib.h> #include <unistd.h> #include <string.h> #include <fcntl.h> #include <shadow.h> int __getspent_r(struct spwd * spwd, char * line_buff, size_t buflen, int spwd_fd) { char *endptr; int line_len; /* We use the restart label to handle malformatted lines */ restart: /* Read the shadow line into the static buffer using a minimal of syscalls. */ if ((line_len = read(spwd_fd, line_buff, buflen)) <= 0) return -1; endptr = strchr(line_buff, '\n'); if (endptr != NULL) lseek(spwd_fd, (long) (1 + endptr - (line_buff + line_len)), SEEK_CUR); else { /* The line is too long - skip it. :-\ */ do { if ((line_len = read(spwd_fd, line_buff, buflen)) <= 0) return -1; } while (!(endptr = strchr(line_buff, '\n'))); lseek(spwd_fd, (long) (endptr - line_buff) - line_len + 1, SEEK_CUR); goto restart; } if (__sgetspent_r(line_buff, spwd, line_buff, buflen) < 0) goto restart; return 0; }