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typecheck: allow NULL to unset CURLOPT_ERRORBUFFER

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There might be situations where a user would want to unset this option.
Avoid forcing him/her to cast the NULL argument to (char *) in order to
get past the compile time typecheck.
This commit is contained in:
Dave Reisner 2011-10-11 03:24:40 +02:00 committed by Daniel Stenberg
parent 1a416cd27a
commit 62bcf005f4
1 changed files with 2 additions and 1 deletions
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3
include/curl/typecheck-gcc.h
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@ -392,7 +392,8 @@ _CURL_WARNING(_curl_easy_getinfo_err_curl_slist,
/* evaluates to true if expr is abuffer suitable for CURLOPT_ERRORBUFFER */
/* XXX: also check size of an char[] array? */
#define _curl_is_error_buffer(expr) \
(__builtin_types_compatible_p(__typeof__(expr), char *) || \
(_curl_is_NULL(expr) || \
__builtin_types_compatible_p(__typeof__(expr), char *) || \
__builtin_types_compatible_p(__typeof__(expr), char[]))
/* evaluates to true if expr is of type (const) void* or (const) FILE* */