/* -*- mode: C -*- */
/*
IGraph library.
Copyright (C) 2012 Gabor Csardi <csardi.gabor@gmail.com>
334 Harvard street, Cambridge, MA 02139 USA
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "igraph_types.h"
#include <float.h>
#ifdef _MSC_VER
#define snprintf _snprintf
#endif
#ifdef DBL_DIG
/* Use DBL_DIG to determine the maximum precision used for %g */
#define STRINGIFY_HELPER(x) #x
#define STRINGIFY(x) STRINGIFY_HELPER(x)
#define IGRAPH_REAL_PRINTF_PRECISE_FORMAT "%." STRINGIFY(DBL_DIG) "g"
#else
/* Assume a precision of 10 digits for %g */
#define IGRAPH_REAL_PRINTF_PRECISE_FORMAT "%.10g"
#endif
#ifndef USING_R
int igraph_real_printf(igraph_real_t val) {
if (igraph_finite(val)) {
return printf("%g", val);
} else if (igraph_is_nan(val)) {
return printf("NaN");
} else if (igraph_is_inf(val)) {
if (val < 0) {
return printf("-Inf");
} else {
return printf("Inf");
}
} else {
/* fallback */
return printf("%g", val);
}
}
#endif
int igraph_real_fprintf(FILE *file, igraph_real_t val) {
if (igraph_finite(val)) {
return fprintf(file, "%g", val);
} else if (igraph_is_nan(val)) {
return fprintf(file, "NaN");
} else if (igraph_is_inf(val)) {
if (val < 0) {
return fprintf(file, "-Inf");
} else {
return fprintf(file, "Inf");
}
} else {
/* fallback */
return fprintf(file, "%g", val);
}
}
int igraph_real_snprintf(char* str, size_t size, igraph_real_t val) {
if (igraph_finite(val)) {
return snprintf(str, size, "%g", val);
} else if (igraph_is_nan(val)) {
return snprintf(str, size, "NaN");
} else if (igraph_is_inf(val)) {
if (val < 0) {
return snprintf(str, size, "-Inf");
} else {
return snprintf(str, size, "Inf");
}
} else {
/* fallback */
return snprintf(str, size, "%g", val);
}
}
#ifndef USING_R
int igraph_real_printf_precise(igraph_real_t val) {
if (igraph_finite(val)) {
return printf(IGRAPH_REAL_PRINTF_PRECISE_FORMAT, val);
} else if (igraph_is_nan(val)) {
return printf("NaN");
} else if (igraph_is_inf(val)) {
if (val < 0) {
return printf("-Inf");
} else {
return printf("Inf");
}
} else {
/* fallback */
return printf(IGRAPH_REAL_PRINTF_PRECISE_FORMAT, val);
}
}
#endif
int igraph_real_fprintf_precise(FILE *file, igraph_real_t val) {
if (igraph_finite(val)) {
return fprintf(file, IGRAPH_REAL_PRINTF_PRECISE_FORMAT, val);
} else if (igraph_is_nan(val)) {
return fprintf(file, "NaN");
} else if (igraph_is_inf(val)) {
if (val < 0) {
return fprintf(file, "-Inf");
} else {
return fprintf(file, "Inf");
}
} else {
/* fallback */
return fprintf(file, IGRAPH_REAL_PRINTF_PRECISE_FORMAT, val);
}
}
int igraph_real_snprintf_precise(char* str, size_t size, igraph_real_t val) {
if (igraph_finite(val)) {
return snprintf(str, size, IGRAPH_REAL_PRINTF_PRECISE_FORMAT, val);
} else if (igraph_is_nan(val)) {
return snprintf(str, size, "NaN");
} else if (igraph_is_inf(val)) {
if (val < 0) {
return snprintf(str, size, "-Inf");
} else {
return snprintf(str, size, "Inf");
}
} else {
/* fallback */
return snprintf(str, size, IGRAPH_REAL_PRINTF_PRECISE_FORMAT, val);
}
}