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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /support/dktools/dk4mai8dbl.ctr
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+%% options
+
+copyright owner = Dirk Krause
+copyright year = 2015-xxxx
+license = bsd
+
+
+
+%% header
+
+/** @file
+ Read double value from char string.
+
+ CRT on Windows: Required.
+*/
+
+#ifndef DK4CONF_H_INCLUDED
+#include "dk4conf.h"
+#endif
+
+#ifndef DK4TYPES_H_INCLUDED
+#include "dk4types.h"
+#endif
+
+#ifndef DK4ERROR_H_INCLUDED
+#include "dk4error.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Read double value from char string.
+ The function temporarily resets the LC_NUMERIC locale setting
+ to "C" to retrieve the number and returns the setting to the
+ original value before returning.
+ @param rp Address of result variable.
+ @param src String to process.
+ @param endptr Address of pointer variable.
+ A pointer to the first character not processed
+ is stored here. The function may also store
+ a NULL pointer here.
+ The pointer variable is probably left unchanged
+ on errors or if strtod() is not available on your
+ system (the sscanf() function is used as fallback).
+ @param atg Allow trailing garbage:
+ 0=no unprocessable trailing bytes allowed,
+ 1=trailing whitespaces allowed,
+ 2=any trailing characaters allowed.
+ @param erp Error report, may be NULL.
+ @return 1 on success, 0 on error.
+
+ Error codes:
+ DK4_E_INVALID_ARGUMENTS if rp or src is NULL,
+ DK4_E_SYNTAX if there are unexpected characters in the
+ string,
+ DK4_E_MATH_OVERFLOW if a mathematical overflow occurs,
+ DK4_E_MATH_UNDERFLOW if a mathematical underflow occurs.
+*/
+
+int
+dk4ma_input_c8_double(
+ double *rp,
+ const char *src,
+ const char **endptr,
+ int atg,
+ dk4_er_t *erp
+);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+%% module
+
+
+#include "dk4mai8dbl.h"
+
+#include "dk4str8.h"
+
+#if DK4_HAVE_ERRNO_H
+#ifndef ERRNO_H_INCLUDED
+#include <errno.h>
+#define ERRNO_H_INCLUDED 1
+#endif
+#endif
+
+#if DK4_HAVE_LOCALE_H
+#ifndef LOCALE_H_INCLUDED
+#include <locale.h>
+#define LOCALE_H_INCLUDED 1
+#endif
+#endif
+
+#if DK4_HAVE_STDLIB_H
+#ifndef STDLIB_H_INCLUDED
+#include <stdlib.h>
+#define STDLIB_H_INCLUDED 1
+#endif
+#endif
+
+#if DK4_HAVE_MATH_H
+#ifndef MATH_H_INCLUDED
+#include <math.h>
+#define MATH_H_INCLUDED 1
+#endif
+#endif
+
+
+
+/** Default locale to use.
+*/
+static const char locale_kw[] = { "C" };
+
+
+
+/** Read double value from char string.
+ @param rp Address of result variable.
+ @param src String to process.
+ @param endptr Address of pointer variable.
+ A pointer to the first character not processed
+ is stored here. The function may also store
+ a NULL pointer here.
+ The pointer variable is probably left unchanged
+ on errors or if strtod() is not available on your
+ system (the sscanf() function is used as fallback).
+ @param atg Allow trailing garbage:
+ 0=no unprocessable trailing bytes allowed,
+ 1=trailing whitespaces allowed,
+ 2=any trailing characaters allowed.
+ @param erp Error report, may be NULL.
+ @return 1 on success, 0 on error.
+
+ Error codes:
+ DK4_E_INVALID_ARGUMENTS if rp or src is NULL,
+ DK4_E_SYNTAX if there are unexpected characters in the
+ string,
+ DK4_E_MATH_OVERFLOW if a mathematical overflow occurs,
+ DK4_E_MATH_UNDERFLOW if a mathematical underflow occurs.
+*/
+
+static
+int
+dk4ma_internal_input_c8_double(
+ double *rp,
+ const char *src,
+ const char **endptr,
+ int atg,
+ dk4_er_t *erp
+)
+{
+#if DK4_HAVE_STRTOD || DK4_HAVE__STRTOD
+ double val = 0.0;
+ char *myend = NULL;
+ int back = 0;
+ int xerr = 0;
+ if ((NULL != rp) && (NULL != src)) {
+ errno = 0;
+#if DK4_HAVE_STRTOD
+ val = strtod(src, &myend);
+#else
+ val = _strtod(src, &myend);
+#endif
+ xerr = errno;
+ if (NULL != endptr) { *endptr = myend; }
+ if (myend != src) {
+ switch (atg) {
+ case 2: {
+ back = 1;
+ } break;
+ case 1: {
+ if (NULL != dk4str8_start(myend, NULL)) {
+ dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
+ } else {
+ back = 1;
+ }
+ } break;
+ default: {
+ if ('\0' == *myend) {
+ back = 1;
+ } else {
+ dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
+ }
+ } break;
+ }
+ if (1 == back) {
+ if (ERANGE == xerr) {
+ if (HUGE_VAL == val) {
+ back = 0;
+ dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
+ }
+ if ((-HUGE_VAL) == val) {
+ back = 0;
+ dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
+ }
+ if (0.0 == val) {
+ back = 0;
+ dk4error_set_simple_error_code(erp, DK4_E_MATH_UNDERFLOW);
+ }
+ }
+ }
+ } else {
+ dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
+ }
+ if (1 == back) {
+ *rp = val;
+ }
+ } else {
+ dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
+ }
+ return back;
+#else
+#if DK4_USE_PRINTF_SCANF
+ double val = 0.0;
+ int back = 0;
+ if ((NULL != rp) && (NULL != src)) {
+ if (1 == sscanf(src, "%lf", &val)) {
+ *rp = val;
+ back = 1;
+ } else {
+ dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
+ }
+ } else {
+ dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
+ }
+ return back;
+#else
+ dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
+ return 0;
+#endif
+#endif
+}
+
+
+
+int
+dk4ma_input_c8_double(
+ double *rp,
+ const char *src,
+ const char **endptr,
+ int atg,
+ dk4_er_t *erp
+)
+{
+#if (DK4_HAVE_SETLOCALE) && defined(LC_NUMERIC)
+ char *oldloc = NULL;
+#endif
+ int back = 0;
+#if (DK4_HAVE_SETLOCALE) && defined(LC_NUMERIC)
+ oldloc = setlocale(LC_NUMERIC, NULL);
+ (void)setlocale(LC_NUMERIC, locale_kw);
+ back = dk4ma_internal_input_c8_double(rp, src, endptr, atg, erp);
+ (void)setlocale(LC_NUMERIC, oldloc);
+#else
+ back = dk4ma_internal_input_c8_double(rp, src, endptr, atg, erp);
+#endif
+ return back;
+}
+
+