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tweaks: elide a function from a non-UTF8 build

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In a non-UTF8 build, mbwidth() returns always 1, so it is pointless
to call that function and compare its result to zero then.

Also, don't bother special-casing the function for a non-UTF8 locale.
This commit is contained in:
Benno Schulenberg 2019-10-03 10:25:58 +02:00
parent 3158133edd
commit b02dccc51f
3 changed files with 11 additions and 8 deletions
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9
src/chars.c
View File

@ -200,11 +200,10 @@ char control_mbrep(const char *c, bool isdata)
return control_rep(*c);
}
#ifdef ENABLE_UTF8
/* This function is equivalent to wcwidth() for multibyte characters. */
int mbwidth(const char *c)
{
#ifdef ENABLE_UTF8
if (use_utf8) {
wchar_t wc;
int width;
@ -213,14 +212,12 @@ int mbwidth(const char *c)
width = wcwidth(wc);
if (width == -1)
if (width < 0)
return 1;
return width;
} else
#endif
return 1;
}
#endif
/* Convert the Unicode value in code to a multibyte character, if possible.
* If the conversion succeeds, return the (dynamically allocated) multibyte

2
src/proto.h
View File

@ -213,7 +213,9 @@ bool is_ascii_cntrl_char(int c);
bool is_cntrl_mbchar(const char *c);
bool is_word_mbchar(const char *c, bool allow_punct);
char control_mbrep(const char *c, bool isdata);
#ifdef ENABLE_UTF8
int mbwidth(const char *c);
#endif
char *make_mbchar(long chr, int *chr_mb_len);
int char_length(const char *pointer);
int parse_mbchar(const char *buf, char *chr, size_t *col);

8
src/winio.c
View File

@ -1890,11 +1890,13 @@ char *display_string(const char *buf, size_t column, size_t span,
#ifdef ENABLE_UTF8
#define ISO8859_CHAR FALSE
#define ZEROWIDTH_CHAR (mbwidth(buf) == 0)
#else
#define ISO8859_CHAR ((unsigned char)*buf > 0x9F)
#define ZEROWIDTH_CHAR FALSE
#endif
while (*buf != '\0' && (column < beyond || mbwidth(buf) == 0)) {
while (*buf != '\0' && (column < beyond || ZEROWIDTH_CHAR)) {
/* A plain printable ASCII character is one byte, one column. */
if (((signed char)*buf > 0x20 && *buf != DEL_CODE) || ISO8859_CHAR) {
converted[index++] = *(buf++);
@ -1983,14 +1985,16 @@ char *display_string(const char *buf, size_t column, size_t span,
/* If there is more text than can be shown, make room for the ">". */
if (column > beyond || (*buf != '\0' && (isprompt ||
(isdata && !ISSET(SOFTWRAP))))) {
#ifdef ENABLE_UTF8
do {
index = step_left(converted, index);
} while (mbwidth(converted + index) == 0);
#ifdef ENABLE_UTF8
/* Display the left half of a two-column character as '['. */
if (mbwidth(converted + index) == 2)
converted[index++] = '[';
#else
index--;
#endif
}