93 lines
1.4 KiB
C
93 lines
1.4 KiB
C
/*++
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Copyright (c) 2024-2025, Quinn Stephens.
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Provided under the BSD 3-Clause license.
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Module Name:
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wprintf.c
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Abstract:
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Provides wide formatted string printing routines.
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--*/
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#include <wchar.h>
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static
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size_t
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print_hex (
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wchar_t *wcs,
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size_t maxlen,
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unsigned int num
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)
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{
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wchar_t *dest;
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size_t n;
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int shift;
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unsigned int x;
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dest = wcs;
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n = 0;
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shift = 28;
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while (n < maxlen && shift >= 0) {
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x = (num >> shift) & 0xF;
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if (x >= 0xa) {
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*dest = 'a' + (x - 0xa);
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} else {
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*dest = '0' + x;
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}
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dest++;
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n++;
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shift -= 4;
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}
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return n;
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}
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int
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vswprintf (
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wchar_t *wcs,
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size_t maxlen,
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const wchar_t *format,
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va_list args
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)
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{
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wchar_t *dest;
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size_t n, size;
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dest = wcs;
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n = 0;
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while (n < maxlen && *format != '\0') {
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if (*format != '%') {
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*dest++ = *format++;
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n++;
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continue;
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}
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format++;
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switch (*format) {
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case 'x':
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size = print_hex(dest, maxlen - n, va_arg(args, unsigned int));
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n += size;
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dest += size;
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format++;
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break;
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case '\0':
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break;
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case '%':
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default:
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*dest++ = *format++;
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n++;
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break;
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}
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}
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wcs[n] = '\0';
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return (int)n;
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}
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