95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
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* Copyright (c) 2013, 2023 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* pwd/scanfpwent.c
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* Parse passwd entry.
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*/
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#include <ctype.h>
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#include <inttypes.h>
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#include <pwd.h>
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#include <stdbool.h>
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#include <stddef.h>
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static char* next_field(char** current)
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{
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char* result = *current;
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if ( result )
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{
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char* next = result;
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while ( *next && *next != ':' )
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next++;
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if ( !*next )
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next = NULL;
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else
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*next++ = '\0';
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*current = next;
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}
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return result;
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}
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static bool next_field_uintmax(char** current, uintmax_t* result)
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{
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char* id_str = next_field(current);
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if ( !id_str )
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return false;
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char* id_endptr;
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uintmax_t id_umax = strtoumax(id_str, &id_endptr, 10);
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if ( *id_endptr )
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return false;
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*result = id_umax;
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return true;
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}
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static bool next_field_gid(char** current, gid_t* result)
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{
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uintmax_t id_umax;
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if ( !next_field_uintmax(current, &id_umax) )
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return false;
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gid_t gid = (gid_t) id_umax;
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if ( (uintmax_t) gid != (uintmax_t) id_umax )
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return false;
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*result = gid;
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return true;
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}
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static bool next_field_uid(char** current, uid_t* result)
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{
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uintmax_t id_umax;
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if ( !next_field_uintmax(current, &id_umax) )
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return false;
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uid_t uid = (uid_t) id_umax;
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if ( (uintmax_t) uid != (uintmax_t) id_umax )
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return false;
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*result = uid;
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return true;
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}
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int scanpwent(char* str, struct passwd* passwd)
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{
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while ( *str && isspace((unsigned char) *str) )
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str++;
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if ( !*str || *str == '#' ||
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!(passwd->pw_name = next_field(&str)) ||
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!(passwd->pw_passwd = next_field(&str)) ||
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!next_field_uid(&str, &passwd->pw_uid) ||
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!next_field_gid(&str, &passwd->pw_gid) ||
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!(passwd->pw_gecos = next_field(&str)) ||
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!(passwd->pw_dir = next_field(&str)) ||
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!(passwd->pw_shell = next_field(&str)) )
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return 0;
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return 1;
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}
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