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47ca54505c
At the moment, we need trash chunks almost everywhere and the only correctly implemented one is in the sample code. Let's move this to the chunks so that all other places can use this allocator. Additionally, the get_trash_chunk() function now really returns two different chunks. Previously it used to always overwrite the same chunk and point it to a different buffer, which was a bit tricky because it's not obvious that two consecutive results do alias each other.
142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
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* include/common/chunk.h
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* Chunk management definitions, macros and inline functions.
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*
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* Copyright (C) 2000-2012 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _TYPES_CHUNK_H
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#define _TYPES_CHUNK_H
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#include <stdlib.h>
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#include <string.h>
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#include <common/config.h>
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/* describes a chunk of string */
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struct chunk {
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char *str; /* beginning of the string itself. Might not be 0-terminated */
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int size; /* total size of the buffer, 0 if the *str is read-only */
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int len; /* current size of the string from first to last char. <0 = uninit. */
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};
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/* function prototypes */
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int chunk_printf(struct chunk *chk, const char *fmt, ...)
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__attribute__ ((format(printf, 2, 3)));
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int chunk_appendf(struct chunk *chk, const char *fmt, ...)
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__attribute__ ((format(printf, 2, 3)));
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int chunk_htmlencode(struct chunk *dst, struct chunk *src);
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int chunk_asciiencode(struct chunk *dst, struct chunk *src, char qc);
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int chunk_strcmp(const struct chunk *chk, const char *str);
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int chunk_strcasecmp(const struct chunk *chk, const char *str);
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int alloc_trash_buffers(int bufsize);
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struct chunk *get_trash_chunk(void);
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static inline void chunk_reset(struct chunk *chk)
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{
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chk->len = 0;
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}
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static inline void chunk_init(struct chunk *chk, char *str, size_t size)
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{
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chk->str = str;
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chk->len = 0;
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chk->size = size;
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}
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/* report 0 in case of error, 1 if OK. */
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static inline int chunk_initlen(struct chunk *chk, char *str, size_t size, int len)
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{
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if (size && len > size)
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return 0;
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chk->str = str;
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chk->len = len;
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chk->size = size;
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return 1;
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}
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static inline void chunk_initstr(struct chunk *chk, char *str)
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{
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chk->str = str;
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chk->len = strlen(str);
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chk->size = 0; /* mark it read-only */
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}
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static inline int chunk_strcpy(struct chunk *chk, const char *str)
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{
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size_t len;
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len = strlen(str);
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if (unlikely(len > chk->size))
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return 0;
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chk->len = len;
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memcpy(chk->str, str, len);
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return 1;
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}
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static inline void chunk_drop(struct chunk *chk)
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{
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chk->str = NULL;
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chk->len = -1;
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chk->size = 0;
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}
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static inline void chunk_destroy(struct chunk *chk)
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{
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if (!chk->size)
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return;
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free(chk->str);
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chunk_drop(chk);
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}
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/*
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* frees the destination chunk if already allocated, allocates a new string,
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* and copies the source into it. The pointer to the destination string is
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* returned, or NULL if the allocation fails or if any pointer is NULL..
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*/
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static inline char *chunk_dup(struct chunk *dst, const struct chunk *src)
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{
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if (!dst || !src || !src->str)
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return NULL;
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if (dst->str)
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free(dst->str);
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dst->len = src->len;
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dst->str = (char *)malloc(dst->len);
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memcpy(dst->str, src->str, dst->len);
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return dst->str;
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}
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#endif /* _TYPES_CHUNK_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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