/*      $NetBSD: buf.c,v 1.58 2024/04/28 15:10:19 rillig Exp $  */

/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* Copyright (c) 1988, 1989 by Adam de Boor
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/* Automatically growing null-terminated buffers of characters. */

#include <limits.h>
#include "make.h"

/*      "@(#)buf.c      8.1 (Berkeley) 6/6/93"  */
MAKE_RCSID("$NetBSD: buf.c,v 1.58 2024/04/28 15:10:19 rillig Exp $");

/* Make space in the buffer for adding at least 16 more bytes. */
void
Buf_Expand(Buffer *buf)
{
       buf->cap += buf->cap > 16 ? buf->cap : 16;
       buf->data = bmake_realloc(buf->data, buf->cap);
}

/* Add the bytes to the buffer. */
void
Buf_AddBytes(Buffer *buf, const char *bytes, size_t bytes_len)
{
       size_t old_len = buf->len;
       char *end;

       if (old_len + bytes_len >= buf->cap) {
               size_t minIncr = bytes_len + 16;
               buf->cap += buf->cap > minIncr ? buf->cap : minIncr;
               buf->data = bmake_realloc(buf->data, buf->cap);
       }

       end = buf->data + old_len;
       buf->len = old_len + bytes_len;
       memcpy(end, bytes, bytes_len);
       end[bytes_len] = '\0';
}

/* Add the bytes between start and end to the buffer. */
void
Buf_AddRange(Buffer *buf, const char *start, const char *end)
{
       Buf_AddBytes(buf, start, (size_t)(end - start));
}

/* Add the string to the buffer. */
void
Buf_AddStr(Buffer *buf, const char *str)
{
       Buf_AddBytes(buf, str, strlen(str));
}

/* Add the number to the buffer. */
void
Buf_AddInt(Buffer *buf, int n)
{
       char str[sizeof(int) * CHAR_BIT + 1];

       size_t len = (size_t)snprintf(str, sizeof str, "%d", n);
       Buf_AddBytes(buf, str, len);
}

void
Buf_AddFlag(Buffer *buf, bool flag, const char *name)
{
       if (flag) {
               if (buf->len > 0)
                       Buf_AddByte(buf, '|');
               Buf_AddBytes(buf, name, strlen(name));
       }
}

/* Initialize a buffer. */
void
Buf_InitSize(Buffer *buf, size_t cap)
{
       buf->cap = cap;
       buf->len = 0;
       buf->data = bmake_malloc(cap);
       buf->data[0] = '\0';
}

void
Buf_Init(Buffer *buf)
{
       Buf_InitSize(buf, 256);
}

/*
* Free the data from the buffer.
* Leave the buffer itself in an indeterminate state.
*/
void
Buf_Done(Buffer *buf)
{
       free(buf->data);

#ifdef CLEANUP
       buf->cap = 0;
       buf->len = 0;
       buf->data = NULL;
#endif
}

/*
* Return the data from the buffer.
* Leave the buffer itself in an indeterminate state.
*/
char *
Buf_DoneData(Buffer *buf)
{
       char *data = buf->data;

#ifdef CLEANUP
       buf->cap = 0;
       buf->len = 0;
       buf->data = NULL;
#endif

       return data;
}