%% options copyright owner = Dirk Krause copyright year = 2015-xxxx license = bsd %% header /** @file Double to char text conversion using the more secure functions _snprintf_s(), _snprintf() or snprintf() instead of sprintf() if available. 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 #ifndef STDLIB_H_INCLUDED #include #define STDLIB_H_INCLUDED 1 #endif #ifdef __cplusplus extern "C" { #endif /** Convert double value to string. @param dptr Destination buffer pointer. @param szdptr Size of destination buffer. @param v Value to convert. @param exact Flag: Create exact representation. @param minimize Minimize exact representation. @param erp Error report, may be NULL. @return 1 on success, 0 on error. Error codes: - DK4_E_INVALID_ARGUMENTS
if dptr is NULL or szdptr is less than 2, - DK4_E_BUFFER_TOO_SMALL
if the destination buffer is too small to store the string. */ int dk4ma_write_c8_double( char *dptr, size_t szdptr, double v, int exact, int minimize, dk4_er_t *erp ); #ifdef __cplusplus } #endif %% module #include "dk4mao8dbl.h" #include "dk4str8.h" #if DK4_HAVE_LOCALE_H #ifndef LOCALE_H_INCLUDED #include #define LOCALE_H_INCLUDED 1 #endif #endif $!trace-include /** Format strings used for printf family. */ static const char * const dk4double_format_strings[] = { /* 0 */ "%.*e", /* 1 */ "%g", /* 2 */ "C" }; /** Squeeze a double written to string. @param buf Buffer containing the string. */ static void dk4double_squeeze_c8_string(char *buf) { char *ptre = NULL; char *ptrdot = NULL; char *ptrcom = NULL; char *ptrcut = NULL; char *ptr; int useexp = 1; $? "+ dk4double_squeeze_c8_string \"%s\"", TR_8STR(buf) if (NULL != buf) { ptr = buf; while('\0' != *ptr) { switch (*ptr) { case 'e': case 'E': { $? ". exponent found" if (NULL == ptre) { ptre = ptr; } } break; case '.': { $? ". dot found" if (NULL == ptrdot) { ptrdot = ptr; } } break; case ',': { if (NULL == ptrcom) { ptrcom = ptr; } } break; } ptr++; } if (NULL != ptre) { $? ". check exponent" *ptre = '\0'; ptr = ptre; ptr++; $? ". c=\"%c\"", *ptr if (('+' == *ptr) || ('0' == *ptr)) { $? ". leading + or 0" useexp = 0; $? ". useexp = 0" ptr++; while('\0' != *ptr) { $? ". c=\"%c\"", *ptr if ('0' != *ptr) { $? ". non-0 char \"%c\"", *ptr useexp = 1; $? ". useexp = 1" } ptr++; } } } if (NULL != ptrdot) { ptrdot++; if ('\0' != *ptrdot) { $? ". chars after dot" ptrdot++; while('\0' != *ptrdot) { $? ". check \"%c\"", *ptrdot if ('0' == *ptrdot) { if (NULL == ptrcut) { ptrcut = ptrdot; $? ". cut" } } else { ptrcut = NULL; $? ". no cut" } ptrdot++; } } } else { if (NULL != ptrcom) { ptrcom++; if ('\0' != *ptrcom) { ptrcom++; while ('\0' != *ptrcom) { if ('0' == *ptrcom) { if (NULL == ptrcut) { ptrcut = ptrcom; } } else { ptrcut = NULL; } ptrcom++; } } } } if ((NULL != ptre) && (0 != useexp)) { *ptre = 'e'; } if (NULL != ptrcut) { if ((NULL != ptre) && (0 != useexp)) { while ('\0' != *ptre) { *(ptrcut++) = *(ptre++); } } *ptrcut = '\0'; } } $? "- dk4double_squeeze_c8_string \"%s\"", TR_8STR(buf) } static int dk4ma_internal_write_c8_double( char *dptr, size_t szdptr, double v, int exact, int minimize, dk4_er_t *erp ) { #if DK4_HAVE__SNPRINTF_S /* +++ _snprintf_s */ char buf[64]; int back = 0; int res = 0; if (NULL != dptr) { *dptr = '\0'; } if ((NULL != dptr) && (1 < szdptr)) { if (0 != exact) { res = _snprintf_s( buf, sizeof(buf), _TRUNCATE, dk4double_format_strings[0], (int)DK4_DBL_DIGITS, v ); if ((0 < res) && ((size_t)res < sizeof(buf))) { buf[res] = '\0'; if (0 != minimize) { dk4double_squeeze_c8_string(buf); } back = dk4str8_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } else { res = _snprintf_s( buf, sizeof(buf), _TRUNCATE, dk4double_format_strings[1], v ); if ((0 < res) && ((size_t)res < sizeof(buf))) { buf[res] = '\0'; back = dk4str8_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } } else { dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS); } return back; /* --- _snprintf_s */ #else #if DK4_HAVE__SNPRINTF /* +++ _snprintf */ char buf[64]; int back = 0; int res = 0; if (NULL != dptr) { *dptr = '\0'; } if ((NULL != dptr) && (1 < szdptr)) { if (0 != exact) { res = _snprintf( buf, sizeof(buf), dk4double_format_strings[0], (int)DK4_DBL_DIGITS, v ); if ((0 < res) && ((size_t)res < sizeof(buf))) { buf[res] = '\0'; if (0 != minimize) { dk4double_squeeze_c8_string(buf); } back = dk4str8_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } else { res = _snprintf(buf, sizeof(buf), dk4double_format_strings[1], v); if ((0 < res) && ((size_t)res < sizeof(buf))) { buf[res] = '\0'; back = dk4str8_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } } else { dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS); } return back; /* --- _snprintf */ #else #if DK4_HAVE_SNPRINTF /* +++ snprintf */ char buf[64]; int back = 0; int res = 0; if (NULL != dptr) { *dptr = '\0'; } if ((NULL != dptr) && (1 < szdptr)) { if (0 != exact) { res = snprintf( buf, sizeof(buf), dk4double_format_strings[0], (int)DK4_DBL_DIGITS, v ); if ((0 < res) && ((size_t)res < sizeof(buf))) { buf[res] = '\0'; if (0 != minimize) { dk4double_squeeze_c8_string(buf); } back = dk4str8_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } else { res = snprintf(buf, sizeof(buf), dk4double_format_strings[1], v); if ((0 < res) && ((size_t)res < sizeof(buf))) { buf[res] = '\0'; back = dk4str8_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } } else { dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS); } return back; /* --- snprintf */ #else /* +++ sprintf */ char buf[64]; int back = 0; int res = 0; if (NULL != dptr) { *dptr = '\0'; } if ((NULL != dptr) && (1 < szdptr)) { if (0 != exact) { sprintf(buf, dk4double_format_strings[0], (int)DK4_DBL_DIGITS, v); if (0 != minimize) { dk4double_squeeze_c8_string(buf); } back = dk4str8_cpy_s(dptr, szdptr, buf, erp); } else { sprintf(buf, dk4double_format_strings[1], v); back = dk4str8_cpy_s(dptr, szdptr, buf, erp); } } else { dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS); } return back; /* --- sprintf */ #endif #endif #endif } int dk4ma_write_c8_double( char *dptr, size_t szdptr, double v, int exact, int minimize, 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, dk4double_format_strings[2]); #endif back = dk4ma_internal_write_c8_double(dptr, szdptr, v, exact, minimize, erp); #if (DK4_HAVE_SETLOCALE) && defined(LC_NUMERIC) (void)setlocale(LC_NUMERIC, oldloc); #endif return back; }