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common: New function get_membuf_shrink.

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* common/membuf.c (get_membuf_shrink): New.
This commit is contained in:
Werner Koch 2014-02-26 16:16:30 +01:00
parent 55c3e5f448
commit 556562086a
2 changed files with 26 additions and 0 deletions
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25
common/membuf.c
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@ -170,6 +170,31 @@ get_membuf (membuf_t *mb, size_t *len)
} }
/* Same as get_membuf but shrinks the reallocated space to the
required size. */
void *
get_membuf_shrink (membuf_t *mb, size_t *len)
{
void *p, *pp;
size_t dummylen;
if (!len)
len = &dummylen;
p = get_membuf (mb, &len);
if (!p)
return NULL;
if (len)
{
pp = xtryrealloc (p, len);
if (pp)
p = pp;
}
return p;
}
/* Peek at the membuf MB. On success a pointer to the buffer is /* Peek at the membuf MB. On success a pointer to the buffer is
returned which is valid until the next operation on MB. If LEN is returned which is valid until the next operation on MB. If LEN is
not NULL the current LEN of the buffer is stored there. On error not NULL the current LEN of the buffer is stored there. On error

1
common/membuf.h
View File

@ -57,6 +57,7 @@ void put_membuf_str (membuf_t *mb, const char *string);
void put_membuf_printf (membuf_t *mb, const char *format, void put_membuf_printf (membuf_t *mb, const char *format,
...) JNLIB_GCC_A_PRINTF(2,3); ...) JNLIB_GCC_A_PRINTF(2,3);
void *get_membuf (membuf_t *mb, size_t *len); void *get_membuf (membuf_t *mb, size_t *len);
void *get_membuf_shrink (membuf_t *mb, size_t *len);
const void *peek_membuf (membuf_t *mb, size_t *len); const void *peek_membuf (membuf_t *mb, size_t *len);
#endif /*GNUPG_COMMON_MEMBUF_H*/ #endif /*GNUPG_COMMON_MEMBUF_H*/