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Add a memdup function to util

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svn:r6635
This commit is contained in:
Nick Mathewson 2006-06-18 07:22:36 +00:00
parent 78428dccdb
commit af8096815e
2 changed files with 18 additions and 0 deletions
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16
src/common/util.c
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@ -190,6 +190,22 @@ _tor_strndup(const char *s, size_t n DMALLOC_PARAMS)
return dup; return dup;
} }
/** Allocate a chunk of <b>len</b> bytes, with the same contents starting at
* <b>mem</b>. */
void *
_tor_memdup(const void *mem, size_t len DMALLOC_PARAMS)
{
char *dup;
tor_assert(mem);
dup = _tor_malloc(len DMALLOC_FN_ARGS);
/* Performance note: Ordinarily we prefer strlcpy to strncpy. But
* this function gets called a whole lot, and platform strncpy is
* much faster than strlcpy when strlen(s) is much longer than n.
*/
memcpy(dup, mem, len);
return dup;
}
/* ===== /* =====
* String manipulation * String manipulation
* ===== */ * ===== */

2
src/common/util.h
View File

@ -67,6 +67,7 @@ void *_tor_malloc_zero(size_t size DMALLOC_PARAMS);
void *_tor_realloc(void *ptr, size_t size DMALLOC_PARAMS); void *_tor_realloc(void *ptr, size_t size DMALLOC_PARAMS);
char *_tor_strdup(const char *s DMALLOC_PARAMS); char *_tor_strdup(const char *s DMALLOC_PARAMS);
char *_tor_strndup(const char *s, size_t n DMALLOC_PARAMS); char *_tor_strndup(const char *s, size_t n DMALLOC_PARAMS);
void *_tor_memdup(const void *mem, size_t len DMALLOC_PARAMS);
#ifdef USE_DMALLOC #ifdef USE_DMALLOC
extern int dmalloc_free(const char *file, const int line, void *pnt, extern int dmalloc_free(const char *file, const int line, void *pnt,
const int func_id); const int func_id);
@ -85,6 +86,7 @@ extern int dmalloc_free(const char *file, const int line, void *pnt,
#define tor_realloc(ptr, size) _tor_realloc(ptr, size DMALLOC_ARGS) #define tor_realloc(ptr, size) _tor_realloc(ptr, size DMALLOC_ARGS)
#define tor_strdup(s) _tor_strdup(s DMALLOC_ARGS) #define tor_strdup(s) _tor_strdup(s DMALLOC_ARGS)
#define tor_strndup(s, n) _tor_strndup(s, n DMALLOC_ARGS) #define tor_strndup(s, n) _tor_strndup(s, n DMALLOC_ARGS)
#define tor_memdup(s, n) _tor_strndup(s, n DMALLOC_ARGS)
/* String manipulation */ /* String manipulation */
#define HEX_CHARACTERS "0123456789ABCDEFabcdef" #define HEX_CHARACTERS "0123456789ABCDEFabcdef"