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improve line history functionality

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Jfreegman
2013-12-14 00:36:06 -05:00
parent 34cc4314a5
commit 10ae3865ca
3 changed files with 21 additions and 11 deletions
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27
src/toxic_strings.c
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@ -89,6 +89,20 @@ void reset_buf(wchar_t *buf, size_t *pos, size_t *len)
*len = 0;
}
#define HIST_PURGE MAX_LINE_HIST / 4
/* shifts hist items back and makes room for HIST_PURGE new entries */
static void shift_hist_back(wchar_t (*hst)[MAX_STR_SIZE], int *hst_tot)
{
int i;
int n = MAX_LINE_HIST - HIST_PURGE;
for (i = 0; i < n; ++i)
wmemcpy(hst[i], hst[i+HIST_PURGE], MAX_STR_SIZE);
*hst_tot = n;
}
/* adds a line to the ln_history buffer at hst_pos and sets hst_pos to end of history. */
void add_line_to_hist(const wchar_t *buf, size_t len, wchar_t (*hst)[MAX_STR_SIZE], int *hst_tot,
int *hst_pos)
@ -96,17 +110,12 @@ void add_line_to_hist(const wchar_t *buf, size_t len, wchar_t (*hst)[MAX_STR_SIZ
if (len > MAX_STR_SIZE)
return;
/* If history is full make room for newest entry and don't increment hst_tot */
if (*hst_tot == MAX_LINE_HIST) {
int i;
for (i = 0; i < MAX_LINE_HIST - 1; ++i)
wmemcpy(hst[i], hst[i+1], MAX_STR_SIZE);
} else {
++(*hst_tot);
}
if (*hst_tot >= MAX_LINE_HIST)
shift_hist_back(hst, hst_tot);
++(*hst_tot);
*hst_pos = *hst_tot;
wmemcpy(hst[*hst_tot-1], buf, len + 1);
}