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str.c revision 1.2 
      1 /*
      2  * Copyright (c) 1994 Christos Zoulas
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by Christos Zoulas.
     16  * 4. The name of the author may not be used to endorse or promote products
     17  *    derived from this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     20  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #ifndef lint
     33 static char *rcsid = "$Id: str.c,v 1.2 1995/04/24 13:25:55 cgd Exp $";
     34 #endif
     35 
     36 /*
     37  * Counted strings
     38  */
     39 #include <stdlib.h>
     40 #include <string.h>
     41 
     42 #include "util.h"
     43 #include "str.h"
     44 
     45 /*
     46  * str_init(): Initialize string
     47  */
     48 void
     49 str_init(s)
     50 	struct string  *s;
     51 {
     52 	s->s_str = NULL;
     53 	s->s_len = 0;
     54 }
     55 
     56 
     57 /*
     58  * str_append(): Append string allocating buffer as necessary
     59  */
     60 void
     61 str_append(buf, str, del)
     62 	struct string  *buf;
     63 	const char     *str;
     64 	int             del;
     65 {
     66 	size_t          len = strlen(str) + 1;
     67 
     68 	if (buf->s_str == NULL)
     69 		buf->s_str = emalloc(len);
     70 	else {
     71 		buf->s_str = erealloc(buf->s_str, buf->s_len + len +
     72 						  (del ? 2 : 1));
     73 		if (del)
     74 			buf->s_str[buf->s_len++] = del;
     75 	}
     76 
     77 	memcpy(&buf->s_str[buf->s_len], str, len);
     78 	buf->s_len += len - 1;
     79 }
     80 
     81 /*
     82  * str_prepend(): Prepend string allocating buffer as necessary
     83  */
     84 void
     85 str_prepend(buf, str, del)
     86 	struct string  *buf;
     87 	const char     *str;
     88 	int             del;
     89 {
     90 	char           *ptr, *sptr;
     91 	size_t          len = strlen(str) + 1;
     92 
     93 	sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1));
     94 
     95 	if (del)
     96 		*ptr++ = del;
     97 
     98 	memcpy(ptr, str, len);
     99 
    100 	if (buf->s_str) {
    101 		memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1);
    102 		free(buf->s_str);
    103 	}
    104 
    105 	buf->s_str = sptr;
    106 	buf->s_len += del ? len : len - 1;
    107 }
    108 
    109 /*
    110  * str_free(): Free a string
    111  */
    112 void
    113 str_free(s)
    114 	struct string  *s;
    115 {
    116 	free(s->s_str);
    117 	s->s_str = NULL;
    118 	s->s_len = 0;
    119 }
    120