mirror of
https://github.com/leahneukirchen/mblaze
synced 2024-11-11 13:10:32 +00:00
58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include "u8decode.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 utf-8 is printed as is
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// - rest is assumed to be latin-1, and translated into utf-8
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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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uint32_t c;
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while (s < e) {
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int l = u8decode((char *)s, &c);
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if (l == -1) {
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l = 1;
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if (*s <= 0x9fu) {
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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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/* invalid utf-8, assume it was latin-1 */
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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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} else if (c < 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 (c == 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 (c == '\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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fwrite(s, 1, l, stream);
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}
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s += l;
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}
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}
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