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screen: don't check for every character whether there is still enough space

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Just allocate ample space up front and thus discard the delaying 'if' for
each and every character.  In most cases this will allocate far too much,
but that hardly matters: it is freed again as soon as the line is printed.
This commit is contained in:
Benno Schulenberg 2016-06-05 12:53:02 +02:00
parent feacacc46d
commit cf0eed6c36
1 changed files with 2 additions and 27 deletions
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29
src/winio.c
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@ -1735,8 +1735,6 @@ char *display_string(const char *buf, size_t start_col, size_t len, bool
/* Index in buf of the first character shown. */
size_t column;
/* Screen column that start_index corresponds to. */
size_t alloc_len;
/* The length of memory allocated for converted. */
char *converted;
/* The string we return. */
size_t index;
@ -1759,21 +1757,8 @@ char *display_string(const char *buf, size_t start_col, size_t len, bool
assert(column <= start_col);
/* Make sure there's enough room for the initial character, whether
* it's a multibyte control character, a non-control multibyte
* character, a tab character, or a null terminator. Rationale:
*
* multibyte control character followed by a null terminator:
* 1 byte ('^') + mb_cur_max() bytes + 1 byte ('\0')
* multibyte non-control character followed by a null terminator:
* mb_cur_max() bytes + 1 byte ('\0')
* tab character followed by a null terminator:
* mb_cur_max() bytes + (tabsize - 1) bytes + 1 byte ('\0')
*
* Since tabsize has a minimum value of 1, it can substitute for 1
* byte above. */
alloc_len = (mb_cur_max() + tabsize + 1) * MAX_BUF_SIZE;
converted = charalloc(alloc_len);
/* Allocate enough space to hold the entire converted buffer. */
converted = charalloc(strlen(buf) * (mb_cur_max() + tabsize) + 1);
index = 0;
seen_wide = FALSE;
@ -1812,14 +1797,6 @@ char *display_string(const char *buf, size_t start_col, size_t len, bool
if (mbwidth(buf + start_index) > 1)
seen_wide = TRUE;
/* Make sure there's enough room for the next character, whether
* it's a multibyte control character, a non-control multibyte
* character, a tab character, or a null terminator. */
if (index + mb_cur_max() + tabsize + 1 >= alloc_len - 1) {
alloc_len += (mb_cur_max() + tabsize + 1) * MAX_BUF_SIZE;
converted = charealloc(converted, alloc_len);
}
if (*buf_mb == ' ') {
/* Show a space as a visible character, or as a space. */
#ifndef NANO_TINY
@ -1882,8 +1859,6 @@ char *display_string(const char *buf, size_t start_col, size_t len, bool
free(buf_mb);
assert(alloc_len >= index + 1);
/* Null-terminate converted. */
converted[index] = '\0';