Mercurial > noffle
view src/itemlist.c @ 243:6eb6c912a0e4 noffle
[svn] * src/group.c: Make comparison against NULL explicit in an if containing
an assignment, as I'm sad enough to think it is safer if it is obvious
that the assignment is meant to be there.
author | bears |
---|---|
date | Fri, 15 Mar 2002 10:49:56 +0000 |
parents | 24d4cd032da5 |
children | 5eece4dfd945 |
line wrap: on
line source
/* itemlist.c $Id: itemlist.c 316 2001-10-31 11:44:53Z bears $ */ #if HAVE_CONFIG_H #include <config.h> #endif #include <ctype.h> #include <string.h> #include <stdlib.h> #include "common.h" #include "itemlist.h" #include "log.h" #include "portable.h" #if defined(ITEMLIST_TEST) #define Log_err printf #endif #define SEP_CHAR '\1' /* Replace all separators with this */ struct ItemList { char *list; char *next; size_t count; }; /* Make a new item list. */ ItemList * new_Itl( const char *list, const char *separators ) { ItemList * res; char *p; Bool inItem; res = malloc( sizeof( ItemList ) ); if ( res == NULL ) { Log_err( "Malloc of ItemList failed." ); exit( EXIT_FAILURE ); } res->list = malloc ( strlen(list) + 2 ); if ( res->list == NULL ) { Log_err( "Malloc of ItemList.list failed." ); exit( EXIT_FAILURE ); } strcpy( res->list, list ); res->count = 0; res->next = res->list; /* Separate items into strings and have final zero-length string. */ for( p = res->list, inItem = FALSE; *p != '\0'; p++ ) { Bool isSep = ( strchr( separators, p[ 0 ] ) != NULL ); if ( inItem ) { if ( isSep ) { p[ 0 ] = '\0'; inItem = FALSE; res->count++; } } else { if ( isSep ) p[ 0 ] = SEP_CHAR; else inItem = TRUE; } } if ( inItem ) res->count++; p[ 1 ] = '\0'; return res; } /* Delete an item list. */ void del_Itl( ItemList *self ) { if ( self == NULL ) return; free( self->list ); free( self ); } /* Get first item. */ const char * Itl_first( ItemList *self) { self->next = self->list; return Itl_next( self ); } /* Get next item or NULL. */ const char * Itl_next( ItemList *self ) { char *res = self->next; if ( res[ 0 ] == '\0' ) return NULL; while ( res[ 0 ] == SEP_CHAR ) res++; if ( res[ 0 ] == '\0' && res[ 1 ] == '\0' ) return NULL; self->next = res + strlen( res ) + 1; return res; } /* Get count of items in list. */ size_t Itl_count( const ItemList *self ) { return self->count; } #if defined(ITEMLIST_TEST) /* Test code borrowed from wildmat.c. Yep, still uses gets(). */ extern char *gets(); int main() { Str line; Str seps; ItemList * itl; int count; const char *item; printf( "Itemlist tester. Enter seperators, then strings to test.\n" ); printf( "A blank line gets prompts for new seperators; blank separators\n" ); printf( "exits the program.\n" ); for ( ; ; ) { printf( "\nEnter seperators: " ); (void) fflush( stdout ); if ( gets( seps ) == NULL || seps[0] == '\0' ) break; for ( ; ; ) { printf( "Enter line: " ); (void) fflush( stdout ); if ( gets( line ) == NULL ) exit( 0 ); if ( line[0] == '\0' ) break; itl = new_Itl( line, seps ); printf( "%d items on list\n", Itl_count( itl ) ); count = 0; for ( item = Itl_first( itl ); item != NULL; item = Itl_next( itl ) ) printf( " Item %d is '%s'\n", ++count, item ); if ( count != Itl_count( itl ) ) printf( "*** Warning - counts don't match ***\n" ); del_Itl( itl ); } } exit(0); /* NOTREACHED */ } #endif /* defined(TEST) */