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ImStrv: standardized code doing format copy, optimized ImStrStr

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ocornut
2021-05-25 14:08:20 +02:00
committed by ocornut
parent 963d39eea7
commit 0dd8e4a528
2 changed files with 57 additions and 33 deletions
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21
imgui.cpp
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@@ -2182,22 +2182,19 @@ const char* ImStristr(const char* haystack, const char* haystack_end, const char
return NULL;
}
// FIXME-IMSTR: probably unneeded.
const char* ImStrstr(ImStrv haystack, ImStrv needle)
{
const char un0 = (char)*needle.Begin;
while ((!haystack.End && *haystack.Begin) || (haystack.End && haystack.Begin < haystack.End))
const char* p = haystack.Begin;
const size_t needle_len_m1 = needle.length() - 1;
while (true)
{
if (*haystack.Begin == un0)
{
const char* b = needle.Begin + 1;
for (const char* a = haystack.Begin + 1; b < needle.End; a++, b++)
if (*a != *b)
break;
if (b == needle.End)
return haystack.Begin;
}
haystack.Begin++;
p = (const char*)memchr(p, un0, haystack.End - p);
if (p == NULL || (size_t)(haystack.End - p) - 1u < needle_len_m1)
return NULL;
if (needle_len_m1 == 0 || memcmp(p + 1, needle.Begin + 1, needle_len_m1) == 0)
return p;
p += 1;
}
return NULL;
}