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      1 /*	$NetBSD: str.c,v 1.7 2009/10/21 01:07:47 snj Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994 Christos Zoulas
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 #ifndef lint
     31 __RCSID("$NetBSD: str.c,v 1.7 2009/10/21 01:07:47 snj Exp $");
     32 #endif
     33 
     34 /*
     35  * Counted strings
     36  */
     37 #include <stdlib.h>
     38 #include <string.h>
     39 #include <err.h>
     40 #include <util.h>
     41 
     42 #include "str.h"
     43 
     44 /*
     45  * str_init(): Initialize string
     46  */
     47 void
     48 str_init(struct string  *s)
     49 {
     50 	s->s_str = NULL;
     51 	s->s_len = 0;
     52 }
     53 
     54 
     55 /*
     56  * str_append(): Append string allocating buffer as necessary
     57  */
     58 void
     59 str_append(struct string  *buf, const char *str, int del)
     60 {
     61 	size_t          len = strlen(str) + 1;
     62 
     63 	if (buf->s_str == NULL)
     64 		buf->s_str = emalloc(len);
     65 	else {
     66 		buf->s_str = erealloc(buf->s_str, buf->s_len + len +
     67 						  (del ? 2 : 1));
     68 		if (del)
     69 			buf->s_str[buf->s_len++] = del;
     70 	}
     71 
     72 	memcpy(&buf->s_str[buf->s_len], str, len);
     73 	buf->s_len += len - 1;
     74 }
     75 
     76 /*
     77  * str_prepend(): Prepend string allocating buffer as necessary
     78  */
     79 void
     80 str_prepend(struct string *buf, const char *str, int del)
     81 {
     82 	char           *ptr, *sptr;
     83 	size_t          len = strlen(str) + 1;
     84 
     85 	sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1));
     86 
     87 	if (del)
     88 		*ptr++ = del;
     89 
     90 	memcpy(ptr, str, len);
     91 
     92 	if (buf->s_str) {
     93 		memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1);
     94 		free(buf->s_str);
     95 	}
     96 
     97 	buf->s_str = sptr;
     98 	buf->s_len += del ? len : len - 1;
     99 }
    100 
    101 /*
    102  * str_free(): Free a string
    103  */
    104 void
    105 str_free(struct string *s)
    106 {
    107 	free(s->s_str);
    108 	s->s_str = NULL;
    109 	s->s_len = 0;
    110 }
    111