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77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
#include <stdint.h>
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#include <stdio.h>
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void
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safe_u8putstr(char *s0, size_t l, FILE *stream)
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{
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// tty-safe output of s, with relaxed utf-8 semantics:
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// - C0 and C1 are displayed as escape sequences
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// - valid utf8 is printed as is
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// - rest is assumed to be latin1, and translated into utf8
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// - translate CRLF to CR
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unsigned char *s = (unsigned char *)s0;
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unsigned char *e = s + l;
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while (s < e) {
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if ((*s & 0x80) == 0) {
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if (*s < 32 &&
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*s != ' ' && *s != '\t' && *s != '\n' && *s != '\r') {
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// C0
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fputc(0xe2, stream);
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fputc(0x90, stream);
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fputc(0x80+*s, stream);
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} else if (*s == 127) {
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// DEL
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fputc(0xe2, stream);
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fputc(0x90, stream);
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fputc(0xa1, stream);
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} else if (*s == '\r') {
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if (e - s > 1 && s[1] == '\n')
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s++;
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fputc(*s, stream);
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} else {
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// safe ASCII
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fputc(*s, stream);
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}
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} else if ((*s & 0xc0) == 0x80) {
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if (*s >= 0xa0)
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goto latin1;
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// C1
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fputc(0xe2, stream);
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fputc(0x90, stream);
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fputc(0x80+0x1b, stream);
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fputc(0xe2, stream);
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fputc(0x90, stream);
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fputc(*s, stream);
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} else {
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uint32_t f = 0;
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if (e - s >= 4)
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f = (s[0]<<24) | (s[1]<<16) | (s[2]<<8) | s[3];
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else if (e - s == 3)
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f = (s[0]<<24) | (s[1]<<16) | (s[2]<<8);
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else if (e - s == 2)
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f = (s[0]<<24) | (s[1]<<16);
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else if (e - s == 1)
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f = (s[0]<<24);
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if ((f & 0xe0c00000) == 0xc0800000) goto u2;
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else if ((f & 0xf0c0c000) == 0xe0808000) goto u3;
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else if ((f & 0xf8c0c0c0) == 0xf0808080) {
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fputc(*s++, stream);
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u3: fputc(*s++, stream);
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u2: fputc(*s++, stream);
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fputc(*s, stream);
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} else {
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latin1:
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/* invalid utf8, assume it was latin1 */
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fputc(0xc0 | (*s >> 6), stream);
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fputc(0x80 | (*s & 0x3f), stream);
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}
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}
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s++;
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}
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}
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