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str.c revision 1.1 
      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 1.1 1994/12/04 17:11:04 christos Exp $";
     34 #endif
     35 
     36 /*
     37  * Counted strings
     38  */
     39 #include <stdlib.h>
     40 
     41 #include "util.h"
     42 #include "str.h"
     43 
     44 /*
     45  * str_init(): Initialize string
     46  */
     47 void
     48 str_init(s)
     49 	struct string  *s;
     50 {
     51 	s->s_str = NULL;
     52 	s->s_len = 0;
     53 }
     54 
     55 
     56 /*
     57  * str_append(): Append string allocating buffer as necessary
     58  */
     59 void
     60 str_append(buf, str, del)
     61 	struct string  *buf;
     62 	const char     *str;
     63 	int             del;
     64 {
     65 	size_t          len = strlen(str) + 1;
     66 
     67 	if (buf->s_str == NULL)
     68 		buf->s_str = emalloc(len);
     69 	else {
     70 		buf->s_str = erealloc(buf->s_str, buf->s_len + len +
     71 						  (del ? 2 : 1));
     72 		if (del)
     73 			buf->s_str[buf->s_len++] = del;
     74 	}
     75 
     76 	memcpy(&buf->s_str[buf->s_len], str, len);
     77 	buf->s_len += len - 1;
     78 }
     79 
     80 /*
     81  * str_prepend(): Prepend string allocating buffer as necessary
     82  */
     83 void
     84 str_prepend(buf, str, del)
     85 	struct string  *buf;
     86 	const char     *str;
     87 	int             del;
     88 {
     89 	char           *ptr, *sptr;
     90 	size_t          len = strlen(str) + 1;
     91 
     92 	sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1));
     93 
     94 	if (del)
     95 		*ptr++ = del;
     96 
     97 	memcpy(ptr, str, len);
     98 
     99 	if (buf->s_str) {
    100 		memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1);
    101 		free(buf->s_str);
    102 	}
    103 
    104 	buf->s_str = sptr;
    105 	buf->s_len += del ? len : len - 1;
    106 }
    107 
    108 /*
    109  * str_free(): Free a string
    110  */
    111 void
    112 str_free(s)
    113 	struct string  *s;
    114 {
    115 	free(s->s_str);
    116 	s->s_str = NULL;
    117 	s->s_len = 0;
    118 }
    119