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      1 /*	$NetBSD: buf.c,v 1.58 2024/04/28 15:10:19 rillig Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Adam de Boor.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 /*
     36  * Copyright (c) 1988, 1989 by Adam de Boor
     37  * Copyright (c) 1989 by Berkeley Softworks
     38  * All rights reserved.
     39  *
     40  * This code is derived from software contributed to Berkeley by
     41  * Adam de Boor.
     42  *
     43  * Redistribution and use in source and binary forms, with or without
     44  * modification, are permitted provided that the following conditions
     45  * are met:
     46  * 1. Redistributions of source code must retain the above copyright
     47  *    notice, this list of conditions and the following disclaimer.
     48  * 2. Redistributions in binary form must reproduce the above copyright
     49  *    notice, this list of conditions and the following disclaimer in the
     50  *    documentation and/or other materials provided with the distribution.
     51  * 3. All advertising materials mentioning features or use of this software
     52  *    must display the following acknowledgement:
     53  *	This product includes software developed by the University of
     54  *	California, Berkeley and its contributors.
     55  * 4. Neither the name of the University nor the names of its contributors
     56  *    may be used to endorse or promote products derived from this software
     57  *    without specific prior written permission.
     58  *
     59  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     69  * SUCH DAMAGE.
     70  */
     71 
     72 /* Automatically growing null-terminated buffers of characters. */
     73 
     74 #include <limits.h>
     75 #include "make.h"
     76 
     77 /*	"@(#)buf.c	8.1 (Berkeley) 6/6/93"	*/
     78 MAKE_RCSID("$NetBSD: buf.c,v 1.58 2024/04/28 15:10:19 rillig Exp $");
     79 
     80 /* Make space in the buffer for adding at least 16 more bytes. */
     81 void
     82 Buf_Expand(Buffer *buf)
     83 {
     84 	buf->cap += buf->cap > 16 ? buf->cap : 16;
     85 	buf->data = bmake_realloc(buf->data, buf->cap);
     86 }
     87 
     88 /* Add the bytes to the buffer. */
     89 void
     90 Buf_AddBytes(Buffer *buf, const char *bytes, size_t bytes_len)
     91 {
     92 	size_t old_len = buf->len;
     93 	char *end;
     94 
     95 	if (old_len + bytes_len >= buf->cap) {
     96 		size_t minIncr = bytes_len + 16;
     97 		buf->cap += buf->cap > minIncr ? buf->cap : minIncr;
     98 		buf->data = bmake_realloc(buf->data, buf->cap);
     99 	}
    100 
    101 	end = buf->data + old_len;
    102 	buf->len = old_len + bytes_len;
    103 	memcpy(end, bytes, bytes_len);
    104 	end[bytes_len] = '\0';
    105 }
    106 
    107 /* Add the bytes between start and end to the buffer. */
    108 void
    109 Buf_AddRange(Buffer *buf, const char *start, const char *end)
    110 {
    111 	Buf_AddBytes(buf, start, (size_t)(end - start));
    112 }
    113 
    114 /* Add the string to the buffer. */
    115 void
    116 Buf_AddStr(Buffer *buf, const char *str)
    117 {
    118 	Buf_AddBytes(buf, str, strlen(str));
    119 }
    120 
    121 /* Add the number to the buffer. */
    122 void
    123 Buf_AddInt(Buffer *buf, int n)
    124 {
    125 	char str[sizeof(int) * CHAR_BIT + 1];
    126 
    127 	size_t len = (size_t)snprintf(str, sizeof str, "%d", n);
    128 	Buf_AddBytes(buf, str, len);
    129 }
    130 
    131 void
    132 Buf_AddFlag(Buffer *buf, bool flag, const char *name)
    133 {
    134 	if (flag) {
    135 		if (buf->len > 0)
    136 			Buf_AddByte(buf, '|');
    137 		Buf_AddBytes(buf, name, strlen(name));
    138 	}
    139 }
    140 
    141 /* Initialize a buffer. */
    142 void
    143 Buf_InitSize(Buffer *buf, size_t cap)
    144 {
    145 	buf->cap = cap;
    146 	buf->len = 0;
    147 	buf->data = bmake_malloc(cap);
    148 	buf->data[0] = '\0';
    149 }
    150 
    151 void
    152 Buf_Init(Buffer *buf)
    153 {
    154 	Buf_InitSize(buf, 256);
    155 }
    156 
    157 /*
    158  * Free the data from the buffer.
    159  * Leave the buffer itself in an indeterminate state.
    160  */
    161 void
    162 Buf_Done(Buffer *buf)
    163 {
    164 	free(buf->data);
    165 
    166 #ifdef CLEANUP
    167 	buf->cap = 0;
    168 	buf->len = 0;
    169 	buf->data = NULL;
    170 #endif
    171 }
    172 
    173 /*
    174  * Return the data from the buffer.
    175  * Leave the buffer itself in an indeterminate state.
    176  */
    177 char *
    178 Buf_DoneData(Buffer *buf)
    179 {
    180 	char *data = buf->data;
    181 
    182 #ifdef CLEANUP
    183 	buf->cap = 0;
    184 	buf->len = 0;
    185 	buf->data = NULL;
    186 #endif
    187 
    188 	return data;
    189 }
    190