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libstl: use strtof() if available (in stla_read.c)

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strtof() is faster than strtod(), see:
http://www.gnu.org/software/libc/manual/html_node/Parsing-of-Floats.html
"(...) strtof can be substantially faster than strtod, but has less precision"

strtof() was added in C99 so BUILD_STRICT_C90 must be disabled to have any
chance to use it (MSVC does not provide strtof(), GCC does).
This commit is contained in:
Hugues Delorme 2014-01-23 17:30:23 +01:00
parent 5f0f9f9273
commit 90f5f084f6
1 changed files with 8 additions and 3 deletions
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11
src/libstl/stla_read.c
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@ -219,10 +219,15 @@ static int eat_string(foug_stream_fwd_iterator_t* it, foug_string_buffer_t* str_
static int get_real32(const char* str, foug_real32_t* value_ptr) static int get_real32(const char* str, foug_real32_t* value_ptr)
{ {
char* conv_end_ptr; /* for strtod() */ char* end_ptr; /* for strtod() */
*value_ptr = (foug_real32_t)strtod(str, &conv_end_ptr); #ifdef FOUG_HAVE_STRTOF_FUNC
if (conv_end_ptr == str || errno == ERANGE) *value_ptr = strtof(str, &end_ptr); /* Requires C99 */
#else
*value_ptr = (foug_real32_t)strtod(str, &end_ptr);
#endif
if (end_ptr == str || errno == ERANGE)
return -1; return -1;
return 0; return 0;