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dynbuf: return NULL when there's no buffer length

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... as returning a "" is not a good idea as the string is supposed to be
allocated and returning a const string will cause issues.

Reported-by: Brian Carpenter
Follow-up to ed35d6590e
Closes #5405
This commit is contained in:
Daniel Stenberg 2020-05-17 19:47:45 +02:00
parent 2c598cc778
commit 3df42ca949
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2 changed files with 8 additions and 8 deletions
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12
docs/DYNBUF.md
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@ -60,17 +60,17 @@ larger than the buffer length.
char *Curl_dyn_ptr(const struct dynbuf *s);
Returns a `char *` to the buffer. Since the buffer may be reallocated, this
pointer should not be trusted or used anymore after the next buffer
manipulation call.
Returns a `char *` to the buffer if it has a length, otherwise a NULL. Since
the buffer may be reallocated, this pointer should not be trusted or used
anymore after the next buffer manipulation call.
## uptr
unsigned char *Curl_dyn_uptr(const struct dynbuf *s);
Returns an `unsigned char *` to the buffer. Since the buffer may be
reallocated, this pointer should not be trusted or used anymore after the next
buffer manipulation call.
Returns an `unsigned char *` to the buffer if it has a length, otherwise a
NULL. Since the buffer may be reallocated, this pointer should not be trusted
or used anymore after the next buffer manipulation call.
## len