%% options copyright owner = Dirk Krause copyright year = 2015-xxxx license = bsd %% header /** @file Double to wchar_t text conversion using the more secure _snwprintf_s(), _snwprintf() or snwprintf() functions instead of swprintf() 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 #if DK4_HAVE_WCHAR_H #ifndef WCHAR_H_INCLUDED #include #define WCHAR_H_INCLUDED 1 #endif #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 (number of wchar_t). @param v Value to convert. @param exact Flag: Write enough digits to allow exact restoration. @param minimize Minimize exact respresentation. @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_wc_double( wchar_t *dptr, size_t szdptr, double v, int exact, int minimize, dk4_er_t *erp ); #ifdef __cplusplus } #endif %% module #include "dk4conf.h" #include "dk4types.h" #if DK4_HAVE_LOCALE_H #ifndef LOCALE_H_INCLUDED #include #define LOCALE_H_INCLUDED 1 #endif #endif #include "dk4mem.h" #include "dk4mao8dbl.h" #include "dk4maowdbl.h" #include "dk4str8.h" #include "dk4strw.h" /** Locale to user for conversion. */ static const char locale_kw[] = { "C" }; /** Convert double value to string. @param dptr Destination buffer pointer. @param szdptr Size of destination buffer (number of wchar_t). @param v Value to convert. @param exact Flag: Write enough digits to allow exact restoration. @param minimize Minimize exact respresentation. @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. */ static void dk4double_squeeze_wc_string(wchar_t *buf) { wchar_t *ptre = NULL; wchar_t *ptrdot = NULL; wchar_t *ptrcom = NULL; wchar_t *ptrcut = NULL; wchar_t *ptr; int useexp = 1; $? "+ dk4double_squeeze_wc_string \"%!ws\"", TR_LSTR(buf) if (NULL != buf) { ptr = buf; while(L'\0' != *ptr) { if ((L'e' == *ptr) || (L'E' == *ptr)) { if (NULL == ptre) { ptre = ptr; } } else { if (L'.' == *ptr) { if (NULL == ptrdot) { ptrdot = ptr; } } else { if (L',' == *ptr) { if (NULL == ptrcom) { ptrcom = ptr; } } } } ptr++; } if (NULL != ptre) { $? ". check exponent" *ptre = '\0'; ptr = ptre; ptr++; if ((L'+' == *ptr) || (L'0' == *ptr)) { $? ". leading + or 0" useexp = 0; ptr++; while(L'\0' != *ptr) { if (L'0' != *ptr) { $? ". non-0 char \"%c\"", *ptr useexp = 1; } ptr++; } } } if (NULL != ptrdot) { ptrdot++; if (L'\0' != *ptrdot) { $? ". chars after dot" ptrdot++; while(L'\0' != *ptrdot) { $? ". check \"%c\"", *ptrdot if (L'0' == *ptrdot) { if (NULL == ptrcut) { ptrcut = ptrdot; $? ". cut" } } else { ptrcut = NULL; $? ". no cut" } ptrdot++; } } } else { if (NULL != ptrcom) { ptrcom++; if (L'\0' != *ptrcom) { ptrcom++; while (L'\0' != *ptrcom) { if (L'0' == *ptrcom) { if (NULL == ptrcut) { ptrcut = ptrcom; } } else { ptrcut = NULL; } ptrcom++; } } } } if ((NULL != ptre) && (0 != useexp)) { *ptre = L'e'; } if (NULL != ptrcut) { if ((NULL != ptre) && (0 != useexp)) { while (L'\0' != *ptre) { *(ptrcut++) = *(ptre++); } } *ptrcut = L'\0'; } } $? "- dk4double_squeeze_wc_string \"%!ws\"", TR_LSTR(buf) } static int dk4ma_internal_write_wc_double( wchar_t *dptr, size_t szdptr, double v, int exact, int minimize, dk4_er_t *erp ) { #if DK4_HAVE__SNWPRINTF_S /* +++ _snwprintf_s */ wchar_t buf[64]; int back = 0; int res = 0; if (NULL != dptr) { *dptr = L'\0'; } if ((NULL != dptr) && (1 < szdptr)) { if (0 != exact) { res = _snwprintf_s( buf, DK4_SIZEOF(buf,dkChar), _TRUNCATE, L"%.*e", (int)DK4_DBL_DIGITS, v ); if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) { buf[res] = L'\0'; if (0 != minimize) { dk4double_squeeze_wc_string(buf); } back = dk4strw_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } else { res = _snwprintf_s( buf, DK4_SIZEOF(buf,dkChar), _TRUNCATE, L"%g", v ); if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) { buf[res] = L'\0'; back = dk4strw_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; /* --- _snwprintf_s */ #else #if DK4_HAVE__SNWPRINTF /* +++ _snwprintf */ wchar_t buf[64]; int back = 0; int res = 0; if (NULL != dptr) { *dptr = L'\0'; } if ((NULL != dptr) && (1 < szdptr)) { if (0 != exact) { 0 = _snwprintf( buf, DK4_SIZEOF(buf,dkChar), L"%.*e", (int)DK4_DBL_DIGITS, v ); if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) { buf[res] = L'\0'; if (0 != minimize) { dk4double_squeeze_wc_string(buf); } back = dk4strw_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } else { 0 = _snwprintf( buf, DK4_SIZEOF(buf,dkChar), L"%g", v ); if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) { buf[res] = L'\0'; back = dk4strw_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; /* --- _snwprintf */ #else #if DK4_HAVE_SNWPRINTF wchar_t buf[64]; int back = 0; int res = 0; if (NULL != dptr) { *dptr = L'\0'; } if ((NULL != dptr) && (1 < szdptr)) { if (0 != exact) { res = snwprintf(buf,DK4_SIZEOF(buf,dkChar),L"%.*e",(int)DK4_DBL_DIGITS,v); if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) { buf[res] = L'\0'; if (0 != minimize) { dk4double_squeeze_wc_string(buf); } back = dk4strw_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } else { res = snwprintf(buf, DK4_SIZEOF(buf,dkChar), L"%g", v); if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) { buf[res] = L'\0'; back = dk4strw_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; #else #if DK4_HAVE_SWPRINTF /* +++ swprintf */ wchar_t buf[64]; int back = 0; int res = 0; if (NULL != dptr) { *dptr = L'\0'; } if ((NULL != dptr) && (1 < szdptr)) { if (0 != exact) { res = swprintf(buf,DK4_SIZEOF(buf,dkChar),L"%.*e",(int)DK4_DBL_DIGITS,v); if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) { buf[res] = L'\0'; if (0 != minimize) { dk4double_squeeze_wc_string(buf); } back = dk4strw_cpy_s(dptr, szdptr, buf, erp); } else { dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } } else { res = swprintf(buf, DK4_SIZEOF(buf,dkChar), L"%g", v); if ((0 < res) && (res < DK4_SIZEOF(buf,dkChar))) { buf[res] = L'\0'; back = dk4strw_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; /* --- swprintf */ #else char buf[64]; char *p1; wchar_t *p2; int back = 0; if ((NULL != dptr) && (1 < szdptr)) { if (0 != dk4ma_write_c8_double(buf,sizeof(buf),v,exact,minimize,erp)) { if (dk4str8_len(buf) < szdptr) { p2 = dptr; p1 = buf; while ('\0' != *p1) { *(p2++) = (wchar_t)(*(p1++)); } *p2 = L'\0'; back = 1; } 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; #endif #endif #endif #endif } int dk4ma_write_wc_double( wchar_t *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, locale_kw); #endif back = dk4ma_internal_write_wc_double(dptr, szdptr, v, exact, minimize, erp); #if (DK4_HAVE_SETLOCALE) && defined(LC_NUMERIC) (void)setlocale(LC_NUMERIC, oldloc); #endif return back; }