/* Copyright (C) 2003 Manuel Novoa III * * 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. */ /* Nov 6, 2003 Initial version. * * NOTE: This implementation is quite strict about requiring all * field seperators. It also does not allow leading whitespace * except when processing the numeric fields. glibc is more * lenient. See the various glibc difference comments below. * * TODO: * Move to dynamic allocation of (currently staticly allocated) * buffers; especially for the group-related functions since * large group member lists will cause error returns. * */ #include <features.h> #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <string.h> #include <stddef.h> #include <errno.h> #include <assert.h> #include <ctype.h> #include "busybox.h" #include "pwd_.h" #include "grp_.h" #include "shadow_.h" #ifndef _PATH_SHADOW #define _PATH_SHADOW "/etc/shadow" #endif #ifndef _PATH_PASSWD #define _PATH_PASSWD "/etc/passwd" #endif #ifndef _PATH_GROUP #define _PATH_GROUP "/etc/group" #endif /**********************************************************************/ /* Sizes for staticly allocated buffers. */ /* If you change these values, also change _SC_GETPW_R_SIZE_MAX and * _SC_GETGR_R_SIZE_MAX in libc/unistd/sysconf.c to match */ #define PWD_BUFFER_SIZE 256 #define GRP_BUFFER_SIZE 256 /**********************************************************************/ /* Prototypes for internal functions. */ extern int __parsepwent(void *pw, char *line); extern int __parsegrent(void *gr, char *line); extern int __parsespent(void *sp, char *line); extern int __pgsreader(int (*__parserfunc)(void *d, char *line), void *data, char *__restrict line_buff, size_t buflen, FILE *f); /**********************************************************************/ /* For the various fget??ent_r funcs, return * * 0: success * ENOENT: end-of-file encountered * ERANGE: buflen too small * other error values possible. See __pgsreader. * * Also, *result == resultbuf on success and NULL on failure. * * NOTE: glibc difference - For the ENOENT case, glibc also sets errno. * We do not, as it really isn't an error if we reach the end-of-file. * Doing so is analogous to having fgetc() set errno on EOF. */ /**********************************************************************/ #ifdef L_fgetpwent_r int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct passwd **__restrict result) { int rv; *result = NULL; if (!(rv = __pgsreader(__parsepwent, resultbuf, buffer, buflen, stream))) { *result = resultbuf; } return rv; } #endif /**********************************************************************/ #ifdef L_fgetgrent_r int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct group **__restrict result) { int rv; *result = NULL; if (!(rv = __pgsreader(__parsegrent, resultbuf, buffer, buflen, stream))) { *result = resultbuf; } return rv; } #endif /**********************************************************************/ #ifdef L_fgetspent_r int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct spwd **__restrict result) { int rv; *result = NULL; if (!(rv = __pgsreader(__parsespent, resultbuf, buffer, buflen, stream))) { *result = resultbuf; } return rv; } #endif /**********************************************************************/ /* For the various fget??ent funcs, return NULL on failure and a * pointer to the appropriate struct (staticly allocated) on success. */ /**********************************************************************/ #ifdef L_fgetpwent struct passwd *fgetpwent(FILE *stream) { static char buffer[PWD_BUFFER_SIZE]; static struct passwd resultbuf; struct passwd *result; fgetpwent_r(stream, &resultbuf, buffer, sizeof(buffer), &result); return result; } #endif /**********************************************************************/ #ifdef L_fgetgrent struct group *fgetgrent(FILE *stream) { static char buffer[GRP_BUFFER_SIZE]; static struct group resultbuf; struct group *result; fgetgrent_r(stream, &resultbuf, buffer, sizeof(buffer), &result); return result; } #endif /**********************************************************************/ #ifdef L_fgetspent extern int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct spwd **__restrict result); struct spwd *fgetspent(FILE *stream) { static char buffer[PWD_BUFFER_SIZE]; static struct spwd resultbuf; struct spwd *result; fgetspent_r(stream, &resultbuf, buffer, sizeof(buffer), &result); return result; } #endif /**********************************************************************/ #ifdef L_sgetspent_r int sgetspent_r(const char *string, struct spwd *result_buf, char *buffer, size_t buflen, struct spwd **result) { int rv = ERANGE; *result = NULL; if (buflen < PWD_BUFFER_SIZE) { DO_ERANGE: errno=rv; goto DONE; } if (string != buffer) { if (strlen(string) >= buflen) { goto DO_ERANGE; } strcpy(buffer, string); } if (!(rv = __parsespent(result_buf, buffer))) { *result = result_buf; } DONE: return rv; } #endif /**********************************************************************/ #ifdef GETXXKEY_R_FUNC #error GETXXKEY_R_FUNC is already defined! #endif #ifdef L_getpwnam_r #define GETXXKEY_R_FUNC getpwnam_r #define GETXXKEY_R_PARSER __parsepwent #define GETXXKEY_R_ENTTYPE struct passwd #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->pw_name, key)) #define DO_GETXXKEY_R_KEYTYPE const char *__restrict #define DO_GETXXKEY_R_PATHNAME _PATH_PASSWD #endif #ifdef L_getgrnam_r #define GETXXKEY_R_FUNC getgrnam_r #define GETXXKEY_R_PARSER __parsegrent #define GETXXKEY_R_ENTTYPE struct group #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->gr_name, key)) #define DO_GETXXKEY_R_KEYTYPE const char *__restrict #define DO_GETXXKEY_R_PATHNAME _PATH_GROUP #endif #ifdef L_getspnam_r #define GETXXKEY_R_FUNC getspnam_r #define GETXXKEY_R_PARSER __parsespent #define GETXXKEY_R_ENTTYPE struct spwd #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->sp_namp, key)) #define DO_GETXXKEY_R_KEYTYPE const char *__restrict #define DO_GETXXKEY_R_PATHNAME _PATH_SHADOW #endif #ifdef L_getpwuid_r #define GETXXKEY_R_FUNC getpwuid_r #define GETXXKEY_R_PARSER __parsepwent #define GETXXKEY_R_ENTTYPE struct passwd #define GETXXKEY_R_TEST(ENT) ((ENT)->pw_uid == key) #define DO_GETXXKEY_R_KEYTYPE uid_t #define DO_GETXXKEY_R_PATHNAME _PATH_PASSWD #endif #ifdef L_getgrgid_r #define GETXXKEY_R_FUNC getgrgid_r #define GETXXKEY_R_PARSER __parsegrent #define GETXXKEY_R_ENTTYPE struct group #define GETXXKEY_R_TEST(ENT) ((ENT)->gr_gid == key) #define DO_GETXXKEY_R_KEYTYPE gid_t #define DO_GETXXKEY_R_PATHNAME _PATH_GROUP #endif /**********************************************************************/ #ifdef GETXXKEY_R_FUNC int GETXXKEY_R_FUNC(DO_GETXXKEY_R_KEYTYPE key, GETXXKEY_R_ENTTYPE *__restrict resultbuf, char *__restrict buffer, size_t buflen, GETXXKEY_R_ENTTYPE **__restrict result) { FILE *stream; int rv; *result = NULL; if (!(stream = fopen(DO_GETXXKEY_R_PATHNAME, "r"))) { rv = errno; } else { do { if (!(rv = __pgsreader(GETXXKEY_R_PARSER, resultbuf, buffer, buflen, stream)) ) { if (GETXXKEY_R_TEST(resultbuf)) { /* Found key? */ *result = resultbuf; break; } } else { if (rv == ENOENT) { /* end-of-file encountered. */ rv = 0; } break; } } while (1); fclose(stream); } return rv; } #endif /**********************************************************************/ #ifdef L_getpwuid struct passwd *getpwuid(uid_t uid) { static char buffer[PWD_BUFFER_SIZE]; static struct passwd resultbuf; struct passwd *result; getpwuid_r(uid, &resultbuf, buffer, sizeof(buffer), &result); return result; } #endif /**********************************************************************/ #ifdef L_getgrgid struct group *getgrgid(gid_t gid) { static char buffer[GRP_BUFFER_SIZE]; static struct group resultbuf; struct group *result; getgrgid_r(gid, &resultbuf, buffer, sizeof(buffer), &result); return result; } #endif /**********************************************************************/ #ifdef L_getspuid_r /* This function is non-standard and is currently not built. It seems * to have been created as a reentrant version of the non-standard * functions getspuid. Why getspuid was added, I do not know. */ int getspuid_r(uid_t uid, struct spwd *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct spwd **__restrict result) { int rv; struct passwd *pp; struct passwd password; char pwd_buff[PWD_BUFFER_SIZE]; *result = NULL; if (!(rv = getpwuid_r(uid, &password, pwd_buff, sizeof(pwd_buff), &pp))) { rv = getspnam_r(password.pw_name, resultbuf, buffer, buflen, result); } return rv; } #endif /**********************************************************************/ #ifdef L_getspuid /* This function is non-standard and is currently not built. * Why it was added, I do not know. */ struct spwd *getspuid(uid_t uid) { static char buffer[PWD_BUFFER_SIZE]; static struct spwd resultbuf; struct spwd *result; getspuid_r(uid, &resultbuf, buffer, sizeof(buffer), &result); return result; } #endif /**********************************************************************/ #ifdef L_getpwnam struct passwd *getpwnam(const char *name) { static char buffer[PWD_BUFFER_SIZE]; static struct passwd resultbuf; struct passwd *result; getpwnam_r(name, &resultbuf, buffer, sizeof(buffer), &result); return result; } #endif /**********************************************************************/ #ifdef L_getgrnam struct group *getgrnam(const char *name) { static char buffer[GRP_BUFFER_SIZE]; static struct group resultbuf; struct group *result; getgrnam_r(name, &resultbuf, buffer, sizeof(buffer), &result); return result; } #endif /**********************************************************************/ #ifdef L_getspnam struct spwd *getspnam(const char *name) { static char buffer[PWD_BUFFER_SIZE]; static struct spwd resultbuf; struct spwd *result; getspnam_r(name, &resultbuf, buffer, sizeof(buffer), &result); return result; } #endif /**********************************************************************/ #ifdef L_getpw int getpw(uid_t uid, char *buf) { struct passwd resultbuf; struct passwd *result; char buffer[PWD_BUFFER_SIZE]; if (!buf) { errno=EINVAL; } else if (!getpwuid_r(uid, &resultbuf, buffer, sizeof(buffer), &result)) { if (sprintf(buf, "%s:%s:%lu:%lu:%s:%s:%s\n", resultbuf.pw_name, resultbuf.pw_passwd, (unsigned long)(resultbuf.pw_uid), (unsigned long)(resultbuf.pw_gid), resultbuf.pw_gecos, resultbuf.pw_dir, resultbuf.pw_shell) >= 0 ) { return 0; } } return -1; } #endif /**********************************************************************/ #ifdef L_getpwent_r static FILE *pwf /*= NULL*/; void setpwent(void) { if (pwf) { rewind(pwf); } } void endpwent(void) { if (pwf) { fclose(pwf); pwf = NULL; } } int getpwent_r(struct passwd *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct passwd **__restrict result) { int rv; *result = NULL; /* In case of error... */ if (!pwf) { if (!(pwf = fopen(_PATH_PASSWD, "r"))) { rv = errno; goto ERR; } } if (!(rv = __pgsreader(__parsepwent, resultbuf, buffer, buflen, pwf))) { *result = resultbuf; } ERR: return rv; } #endif /**********************************************************************/ #ifdef L_getgrent_r static FILE *grf /*= NULL*/; void setgrent(void) { if (grf) { rewind(grf); } } void endgrent(void) { if (grf) { fclose(grf); grf = NULL; } } int getgrent_r(struct group *__restrict resultbuf, char *__restrict buffer, size_t buflen, struct group **__restrict result) { int rv; *result = NULL; /* In case of error... */ if (!grf) { if (!(grf = fopen(_PATH_GROUP, "r"))) { rv = errno; goto ERR; } } if (!(rv = __pgsreader(__parsegrent, resultbuf, buffer, buflen, grf))) { *result = resultbuf; } ERR: return rv; } #endif /**********************************************************************/ #ifdef L_getspent_r static FILE *spf /*= NULL*/; void setspent(void) { if (spf) { rewind(spf); } } void endspent(void) { if (spf) { fclose(spf); spf = NULL; } } int getspent_r(struct spwd *resultbuf, char *buffer, size_t buflen, struct spwd **result) { int rv; *result = NULL; /* In case of error... */ if (!spf) { if (!(spf = fopen(_PATH_SHADOW, "r"))) { rv = errno; goto ERR; } } if (!(rv = __pgsreader(__parsespent, resultbuf, buffer, buflen, spf))) { *result = resultbuf; } ERR: return rv; } #endif /**********************************************************************/ #ifdef L_getpwent struct passwd *getpwent(void) { static char line_buff[PWD_BUFFER_SIZE]; static struct passwd pwd; struct passwd *result; getpwent_r(&pwd, line_buff, sizeof(line_buff), &result); return result; } #endif /**********************************************************************/ #ifdef L_getgrent struct group *getgrent(void) { static char line_buff[GRP_BUFFER_SIZE]; static struct group gr; struct group *result; getgrent_r(&gr, line_buff, sizeof(line_buff), &result); return result; } #endif /**********************************************************************/ #ifdef L_getspent struct spwd *getspent(void) { static char line_buff[PWD_BUFFER_SIZE]; static struct spwd spwd; struct spwd *result; getspent_r(&spwd, line_buff, sizeof(line_buff), &result); return result; } #endif /**********************************************************************/ #ifdef L_sgetspent struct spwd *sgetspent(const char *string) { static char line_buff[PWD_BUFFER_SIZE]; static struct spwd spwd; struct spwd *result; sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result); return result; } #endif /**********************************************************************/ #ifdef L_initgroups int initgroups(const char *user, gid_t gid) { FILE *grf; gid_t *group_list; int num_groups, rv; char **m; struct group group; char buff[PWD_BUFFER_SIZE]; rv = -1; /* We alloc space for 8 gids at a time. */ if (((group_list = (gid_t *) malloc(8*sizeof(gid_t *))) != NULL) && ((grf = fopen(_PATH_GROUP, "r")) != NULL) ) { *group_list = gid; num_groups = 1; while (!__pgsreader(__parsegrent, &group, buff, sizeof(buff), grf)) { assert(group.gr_mem); /* Must have at least a NULL terminator. */ if (group.gr_gid != gid) { for (m=group.gr_mem ; *m ; m++) { if (!strcmp(*m, user)) { if (!(num_groups & 7)) { gid_t *tmp = (gid_t *) realloc(group_list, (num_groups+8) * sizeof(gid_t *)); if (!tmp) { rv = -1; goto DO_CLOSE; } group_list = tmp; } group_list[num_groups++] = group.gr_gid; break; } } } } rv = setgroups(num_groups, group_list); DO_CLOSE: fclose(grf); } /* group_list will be NULL if initial malloc failed, which may trigger * warnings from various malloc debuggers. */ free(group_list); return rv; } #endif /**********************************************************************/ #ifdef L_putpwent int putpwent(const struct passwd *__restrict p, FILE *__restrict f) { int rv = -1; if (!p || !f) { errno=EINVAL; } else { /* No extra thread locking is needed above what fprintf does. */ if (fprintf(f, "%s:%s:%lu:%lu:%s:%s:%s\n", p->pw_name, p->pw_passwd, (unsigned long)(p->pw_uid), (unsigned long)(p->pw_gid), p->pw_gecos, p->pw_dir, p->pw_shell) >= 0 ) { rv = 0; } } return rv; } #endif /**********************************************************************/ #ifdef L_putgrent int putgrent(const struct group *__restrict p, FILE *__restrict f) { static const char format[] = ",%s"; char **m; const char *fmt; int rv = -1; if (!p || !f) { /* Sigh... glibc checks. */ errno=EINVAL; } else { if (fprintf(f, "%s:%s:%lu:", p->gr_name, p->gr_passwd, (unsigned long)(p->gr_gid)) >= 0 ) { fmt = format + 1; assert(p->gr_mem); m = p->gr_mem; do { if (!*m) { if (fputc_unlocked('\n', f) >= 0) { rv = 0; } break; } if (fprintf(f, fmt, *m) < 0) { break; } ++m; fmt = format; } while (1); } } return rv; } #endif /**********************************************************************/ #ifdef L_putspent static const unsigned char sp_off[] = { offsetof(struct spwd, sp_lstchg), /* 2 - not a char ptr */ offsetof(struct spwd, sp_min), /* 3 - not a char ptr */ offsetof(struct spwd, sp_max), /* 4 - not a char ptr */ offsetof(struct spwd, sp_warn), /* 5 - not a char ptr */ offsetof(struct spwd, sp_inact), /* 6 - not a char ptr */ offsetof(struct spwd, sp_expire), /* 7 - not a char ptr */ }; int putspent(const struct spwd *p, FILE *stream) { static const char ld_format[] = "%ld:"; const char *f; long int x; int i; int rv = -1; /* Unlike putpwent and putgrent, glibc does not check the args. */ if (fprintf(stream, "%s:%s:", p->sp_namp, (p->sp_pwdp ? p->sp_pwdp : "")) < 0 ) { goto DO_UNLOCK; } for (i=0 ; i < sizeof(sp_off) ; i++) { f = ld_format; if ((x = *(const long int *)(((const char *) p) + sp_off[i])) == -1) { f += 3; } if (fprintf(stream, f, x) < 0) { goto DO_UNLOCK; } } if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) { goto DO_UNLOCK; } if (fputc_unlocked('\n', stream) > 0) { rv = 0; } DO_UNLOCK: return rv; } #endif /**********************************************************************/ /* Internal uClibc functions. */ /**********************************************************************/ #ifdef L___parsepwent static const unsigned char pw_off[] = { offsetof(struct passwd, pw_name), /* 0 */ offsetof(struct passwd, pw_passwd), /* 1 */ offsetof(struct passwd, pw_uid), /* 2 - not a char ptr */ offsetof(struct passwd, pw_gid), /* 3 - not a char ptr */ offsetof(struct passwd, pw_gecos), /* 4 */ offsetof(struct passwd, pw_dir), /* 5 */ offsetof(struct passwd, pw_shell) /* 6 */ }; int __parsepwent(void *data, char *line) { char *endptr; char *p; int i; i = 0; do { p = ((char *) ((struct passwd *) data)) + pw_off[i]; if ((i & 6) ^ 2) { /* i!=2 and i!=3 */ *((char **) p) = line; if (i==6) { return 0; } /* NOTE: glibc difference - glibc allows omission of * ':' seperators after the gid field if all remaining * entries are empty. We require all separators. */ if (!(line = strchr(line, ':'))) { break; } } else { unsigned long t = strtoul(line, &endptr, 10); /* Make sure we had at least one digit, and that the * failing char is the next field seperator ':'. See * glibc difference note above. */ /* TODO: Also check for leading whitespace? */ if ((endptr == line) || (*endptr != ':')) { break; } line = endptr; if (i & 1) { /* i == 3 -- gid */ *((gid_t *) p) = t; } else { /* i == 2 -- uid */ *((uid_t *) p) = t; } } *line++ = 0; ++i; } while (1); return -1; } #endif /**********************************************************************/ #ifdef L___parsegrent static const unsigned char gr_off[] = { offsetof(struct group, gr_name), /* 0 */ offsetof(struct group, gr_passwd), /* 1 */ offsetof(struct group, gr_gid) /* 2 - not a char ptr */ }; int __parsegrent(void *data, char *line) { char *endptr; char *p; int i; char **members; char *end_of_buf; end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */ i = 0; do { p = ((char *) ((struct group *) data)) + gr_off[i]; if (i < 2) { *((char **) p) = line; if (!(line = strchr(line, ':'))) { break; } *line++ = 0; ++i; } else { *((gid_t *) p) = strtoul(line, &endptr, 10); /* NOTE: glibc difference - glibc allows omission of the * trailing colon when there is no member list. We treat * this as an error. */ /* Make sure we had at least one digit, and that the * failing char is the next field seperator ':'. See * glibc difference note above. */ if ((endptr == line) || (*endptr != ':')) { break; } i = 1; /* Count terminating NULL ptr. */ p = endptr; if (p[1]) { /* We have a member list to process. */ /* Overwrite the last ':' with a ',' before counting. * This allows us to test for initial ',' and adds * one ',' so that the ',' count equals the member * count. */ *p = ','; do { /* NOTE: glibc difference - glibc allows and trims leading * (but not trailing) space. We treat this as an error. */ /* NOTE: glibc difference - glibc allows consecutive and * trailing commas, and ignores "empty string" users. We * treat this as an error. */ if (*p == ',') { ++i; *p = 0; /* nul-terminate each member string. */ if (!*++p || (*p == ',') || isspace(*p)) { goto ERR; } } } while (*++p); } /* Now align (p+1), rounding up. */ /* Assumes sizeof(char **) is a power of 2. */ members = (char **)( (((intptr_t) p) + sizeof(char **)) & ~((intptr_t)(sizeof(char **) - 1)) ); if (((char *)(members + i)) > end_of_buf) { /* No space. */ break; } ((struct group *) data)->gr_mem = members; if (--i) { p = endptr; /* Pointing to char prior to first member. */ do { *members++ = ++p; if (!--i) break; while (*++p) {} } while (1); } *members = NULL; return 0; } } while (1); ERR: return -1; } #endif /**********************************************************************/ #ifdef L___parsespent static const unsigned char sp_off[] = { offsetof(struct spwd, sp_namp), /* 0 */ offsetof(struct spwd, sp_pwdp), /* 1 */ offsetof(struct spwd, sp_lstchg), /* 2 - not a char ptr */ offsetof(struct spwd, sp_min), /* 3 - not a char ptr */ offsetof(struct spwd, sp_max), /* 4 - not a char ptr */ offsetof(struct spwd, sp_warn), /* 5 - not a char ptr */ offsetof(struct spwd, sp_inact), /* 6 - not a char ptr */ offsetof(struct spwd, sp_expire), /* 7 - not a char ptr */ offsetof(struct spwd, sp_flag) /* 8 - not a char ptr */ }; int __parsespent(void *data, char * line) { char *endptr; char *p; int i; i = 0; do { p = ((char *) ((struct spwd *) data)) + sp_off[i]; if (i < 2) { *((char **) p) = line; if (!(line = strchr(line, ':'))) { break; } } else { #if 0 if (i==5) { /* Support for old format. */ while (isspace(*line)) ++line; /* glibc eats space here. */ if (!*line) { ((struct spwd *) data)->sp_warn = -1; ((struct spwd *) data)->sp_inact = -1; ((struct spwd *) data)->sp_expire = -1; ((struct spwd *) data)->sp_flag = ~0UL; return 0; } } #endif *((long *) p) = (long) strtoul(line, &endptr, 10); if (endptr == line) { *((long *) p) = ((i != 8) ? -1L : ((long)(~0UL))); } line = endptr; if (i == 8) { if (!*endptr) { return 0; } break; } if (*endptr != ':') { break; } } *line++ = 0; ++i; } while (1); return EINVAL; } #endif /**********************************************************************/ #ifdef L___pgsreader /* Reads until if EOF, or until if finds a line which fits in the buffer * and for which the parser function succeeds. * * Returns 0 on success and ENOENT for end-of-file (glibc concession). */ int __pgsreader(int (*__parserfunc)(void *d, char *line), void *data, char *__restrict line_buff, size_t buflen, FILE *f) { int line_len; int skip; int rv = ERANGE; if (buflen < PWD_BUFFER_SIZE) { errno=rv; } else { skip = 0; do { if (!fgets_unlocked(line_buff, buflen, f)) { if (feof_unlocked(f)) { rv = ENOENT; } break; } line_len = strlen(line_buff) - 1; /* strlen() must be > 0. */ if (line_buff[line_len] == '\n') { line_buff[line_len] = 0; } else if (line_len + 2 == buflen) { /* line too long */ ++skip; continue; } if (skip) { --skip; continue; } /* NOTE: glibc difference - glibc strips leading whitespace from * records. We do not allow leading whitespace. */ /* Skip empty lines, comment lines, and lines with leading * whitespace. */ if (*line_buff && (*line_buff != '#') && !isspace(*line_buff)) { if (__parserfunc == __parsegrent) { /* Do evil group hack. */ /* The group entry parsing function needs to know where * the end of the buffer is so that it can construct the * group member ptr table. */ ((struct group *) data)->gr_name = line_buff + buflen; } if (!__parserfunc(data, line_buff)) { rv = 0; break; } } } while (1); } return rv; } #endif /**********************************************************************/