diff options
Diffstat (limited to 'utf8.c')
| -rw-r--r-- | utf8.c | 93 |
1 files changed, 84 insertions, 9 deletions
@@ -323,7 +323,7 @@ static size_t display_mode_esc_sequence_len(const char *s) * If indent is negative, assume that already -indent columns have been * consumed (and no extra indent is necessary for the first line). */ -int strbuf_add_wrapped_text(struct strbuf *buf, +void strbuf_add_wrapped_text(struct strbuf *buf, const char *text, int indent1, int indent2, int width) { int indent, w, assume_utf8 = 1; @@ -332,7 +332,7 @@ int strbuf_add_wrapped_text(struct strbuf *buf, if (width <= 0) { strbuf_add_indented_text(buf, text, indent1, indent2); - return 1; + return; } retry: @@ -356,14 +356,14 @@ retry: if (w <= width || !space) { const char *start = bol; if (!c && text == start) - return w; + return; if (space) start = space; else strbuf_addchars(buf, ' ', indent); strbuf_add(buf, start, text - start); if (!c) - return w; + return; space = text; if (c == '\t') w |= 0x07; @@ -405,13 +405,12 @@ new_line: } } -int strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len, +void strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len, int indent, int indent2, int width) { char *tmp = xstrndup(data, len); - int r = strbuf_add_wrapped_text(buf, tmp, indent, indent2, width); + strbuf_add_wrapped_text(buf, tmp, indent, indent2, width); free(tmp); - return r; } int is_encoding_utf8(const char *name) @@ -431,6 +430,27 @@ int same_encoding(const char *src, const char *dst) } /* + * Wrapper for fprintf and returns the total number of columns required + * for the printed string, assuming that the string is utf8. + */ +int utf8_fprintf(FILE *stream, const char *format, ...) +{ + struct strbuf buf = STRBUF_INIT; + va_list arg; + int columns; + + va_start(arg, format); + strbuf_vaddf(&buf, format, arg); + va_end(arg); + + columns = fputs(buf.buf, stream); + if (0 <= columns) /* keep the error from the I/O */ + columns = utf8_strwidth(buf.buf); + strbuf_release(&buf); + return columns; +} + +/* * Given a buffer and its encoding, return it re-encoded * with iconv. If the conversion fails, returns NULL. */ @@ -487,11 +507,66 @@ char *reencode_string(const char *in, const char *out_encoding, const char *in_e if (!in_encoding) return NULL; + conv = iconv_open(out_encoding, in_encoding); - if (conv == (iconv_t) -1) - return NULL; + if (conv == (iconv_t) -1) { + /* + * Some platforms do not have the variously spelled variants of + * UTF-8, so let's fall back to trying the most official + * spelling. We do so only as a fallback in case the platform + * does understand the user's spelling, but not our official + * one. + */ + if (is_encoding_utf8(in_encoding)) + in_encoding = "UTF-8"; + if (is_encoding_utf8(out_encoding)) + out_encoding = "UTF-8"; + conv = iconv_open(out_encoding, in_encoding); + if (conv == (iconv_t) -1) + return NULL; + } + out = reencode_string_iconv(in, strlen(in), conv); iconv_close(conv); return out; } #endif + +/* + * Returns first character length in bytes for multi-byte `text` according to + * `encoding`. + * + * - The `text` pointer is updated to point at the next character. + * - When `remainder_p` is not NULL, on entry `*remainder_p` is how much bytes + * we can consume from text, and on exit `*remainder_p` is reduced by returned + * character length. Otherwise `text` is treated as limited by NUL. + */ +int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding) +{ + int chrlen; + const char *p = *text; + size_t r = (remainder_p ? *remainder_p : SIZE_MAX); + + if (r < 1) + return 0; + + if (is_encoding_utf8(encoding)) { + pick_one_utf8_char(&p, &r); + + chrlen = p ? (p - *text) + : 1 /* not valid UTF-8 -> raw byte sequence */; + } + else { + /* + * TODO use iconv to decode one char and obtain its chrlen + * for now, let's treat encodings != UTF-8 as one-byte + */ + chrlen = 1; + } + + *text += chrlen; + if (remainder_p) + *remainder_p -= chrlen; + + return chrlen; +} |