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Diffstat (limited to 'src/rcl-zone-utils.c')
| -rw-r--r-- | src/rcl-zone-utils.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/rcl-zone-utils.c b/src/rcl-zone-utils.c new file mode 100644 index 0000000..4ffe8cd --- /dev/null +++ b/src/rcl-zone-utils.c @@ -0,0 +1,230 @@ + +/* + * Copyright (C) 2023 Andrey V.Kosteltsev <kx@radix.pro> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include "rcl-zone-utils.h" + +static gsize strv_lenght( const gchar *const *list ) +{ + gsize len = 0; + gchar **p = (gchar **)list; + + if( !list || *list == NULL ) + return 0; + + while( *p ) + { + ++len; + ++p; + } + + return len; +} + +static gboolean strv_append( const gchar *const **list, const gchar *value ) +{ + gchar **c; + gchar *v; + gsize len; + + if( !list || !value ) + return FALSE; + + len = strv_lenght( *list ); + + v = g_strdup( value ); + if( !v ) + return FALSE; + + c = g_realloc( (gpointer)*list, len * sizeof(gchar *) + sizeof(gchar *) * 2 ); + if( !c ) + { + g_free( (gpointer)v ); + return FALSE; + } + + c[len] = v; + c[len+1] = NULL; + + *list = (const gchar *const *)c; + + return TRUE; +} + +static gint comparator( gconstpointer item1, gconstpointer item2 ) +{ + return g_strcmp0( item1, item2 ); +} + +static GSList *g_slist_insert_sorted_unique( GSList *list, gpointer data, GCompareFunc func ) +{ + if( !data || !func ) + return list; + + if( !g_slist_find_custom( list, data, func ) ) + list = g_slist_insert_sorted( list, data, func ); + + return list; +} + +static GSList *get_timezones_from_tzdata_zi( void ) +{ + GSList *list = NULL; + FILE *fp = NULL; + gchar *ln = NULL, *line = NULL; + + fp = fopen( "/usr/share/zoneinfo/tzdata.zi", "r" ); + if( !fp ) + return list; + + line = (gchar *)g_malloc0( (gsize)PATH_MAX ); + if( !line ) + { + fclose( fp ); + return list; + } + + /********************************************** + Zone line format is: 'Zone' 'timezone' ... + Link line format is: 'Link' 'target' 'alias' + See `man (8) zic' for infirmation. + **********************************************/ + while( (ln = fgets( line, PATH_MAX, fp )) ) + { + gchar *p, *q; + + if( !g_ascii_strncasecmp( ln, "Z", 1 ) ) + { + p = &ln[1]; + + /* Skip spaces */ + while( (*p == ' ' || *p == '\t') && *p != '\n' ) + ++p; + + q = p; + + /* Take the first entry */ + while( *q != ' ' && *q != '\t' && *q != '\n' ) + ++q; + + *q = '\0'; + + list = g_slist_insert_sorted_unique( list, (gpointer)g_strdup( p ), (GCompareFunc)comparator ); + continue; + } + else if( !g_ascii_strncasecmp( ln, "L", 1 ) ) + { + p = &ln[1]; + + /* Skip spaces */ + while( (*p == ' ' || *p == '\t') && *p != '\n' ) + ++p; + + q = p; + + /* Skip the first entry */ + while( *q != ' ' && *q != '\t' && *q != '\n' ) + ++q; + + p = q; + + /* Skip spaces */ + while( (*p == ' ' || *p == '\t') && *p != '\n' ) + ++p; + + q = p; + + /* Take the second entry */ + while( *q != ' ' && *q != '\t' && *q != '\n' ) + ++q; + + *q = '\0'; + + list = g_slist_insert_sorted_unique( list, (gpointer)g_strdup( p ), (GCompareFunc)comparator ); + } + else + { + continue; + } + } + + g_free( (gpointer)line ); + fclose( fp ); + + return list; +} + +void timezones_free( const gchar *const **list ) +{ + gchar **c, **p; + + if( !list || *list == NULL ) + return; + + p = c = (gpointer)*list; + + while( *p ) + { + g_free( (gpointer)*p ); + ++p; + } + + g_free( (gpointer)c ); + + *list = (const gchar *const *)NULL; +} + +void timezones_print( const gchar *const **list ) +{ + gchar **p; + + if( !list || *list == NULL ) + return; + + p = (gpointer)*list; + + while( *p ) + { + g_print( "%s\n", *p ); + ++p; + } +} + +gboolean get_timezones( const gchar *const **list ) +{ + GSList *slist = NULL, *iterator = NULL; + gboolean ret = TRUE; + + slist = get_timezones_from_tzdata_zi(); + if( !slist ) + return FALSE; + + for( iterator = slist; iterator; iterator = iterator->next ) + { + gboolean rc = strv_append( list, (const gchar *)iterator->data ); + if( !rc ) + ret = FALSE; + + g_free( (gpointer)iterator->data ); + } + g_slist_free(slist); + + return ret; +} + |