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str.c revision 1.4 
      1 /*	$NetBSD: str.c,v 1.4 1997/10/17 11:49:10 lukem 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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by Christos Zoulas.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     22  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     25  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 #ifndef lint
     36 __RCSID("$NetBSD: str.c,v 1.4 1997/10/17 11:49:10 lukem Exp $");
     37 #endif
     38 
     39 /*
     40  * Counted strings
     41  */
     42 #include <stdlib.h>
     43 #include <string.h>
     44 
     45 #include "util.h"
     46 #include "str.h"
     47 
     48 /*
     49  * str_init(): Initialize string
     50  */
     51 void
     52 str_init(s)
     53 	struct string  *s;
     54 {
     55 	s->s_str = NULL;
     56 	s->s_len = 0;
     57 }
     58 
     59 
     60 /*
     61  * str_append(): Append string allocating buffer as necessary
     62  */
     63 void
     64 str_append(buf, str, del)
     65 	struct string  *buf;
     66 	const char     *str;
     67 	int             del;
     68 {
     69 	size_t          len = strlen(str) + 1;
     70 
     71 	if (buf->s_str == NULL)
     72 		buf->s_str = emalloc(len);
     73 	else {
     74 		buf->s_str = erealloc(buf->s_str, buf->s_len + len +
     75 						  (del ? 2 : 1));
     76 		if (del)
     77 			buf->s_str[buf->s_len++] = del;
     78 	}
     79 
     80 	memcpy(&buf->s_str[buf->s_len], str, len);
     81 	buf->s_len += len - 1;
     82 }
     83 
     84 /*
     85  * str_prepend(): Prepend string allocating buffer as necessary
     86  */
     87 void
     88 str_prepend(buf, str, del)
     89 	struct string  *buf;
     90 	const char     *str;
     91 	int             del;
     92 {
     93 	char           *ptr, *sptr;
     94 	size_t          len = strlen(str) + 1;
     95 
     96 	sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1));
     97 
     98 	if (del)
     99 		*ptr++ = del;
    100 
    101 	memcpy(ptr, str, len);
    102 
    103 	if (buf->s_str) {
    104 		memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1);
    105 		free(buf->s_str);
    106 	}
    107 
    108 	buf->s_str = sptr;
    109 	buf->s_len += del ? len : len - 1;
    110 }
    111 
    112 /*
    113  * str_free(): Free a string
    114  */
    115 void
    116 str_free(s)
    117 	struct string  *s;
    118 {
    119 	free(s->s_str);
    120 	s->s_str = NULL;
    121 	s->s_len = 0;
    122 }
    123