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LibC: Better strtok implementation (string.h)

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This commit is contained in:
Jonah Alligood 2019-10-16 18:44:42 -05:00 • committed by Andreas Kling
parent a544fded88
commit 437c919dda
1 changed files with 21 additions and 19 deletions
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40
Libraries/LibC/string.cpp
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@ -467,32 +467,34 @@ char* strtok(char* str, const char* delim)
size_t token_start = 0; size_t token_start = 0;
size_t token_end = 0; size_t token_end = 0;
size_t str_len = strlen(str);
size_t delim_len = strlen(delim);
for (size_t i = 0; i < strlen(str); ++i) { for (size_t i = 0; i < str_len; ++i) {
bool is_delim = false; bool is_proper_delim = false;
for (size_t j = 0; j < strlen(delim); ++j) {
for (size_t j = 0; j < delim_len; ++j) {
if (str[i] == delim[j]) { if (str[i] == delim[j]) {
is_delim = true; // Skip beginning delimiters
++token_start; if (token_end - token_start == 0) {
break; ++token_start;
break;
}
is_proper_delim = true;
} }
} }
if (!is_delim) break;
}
if (strlen(&str[token_start]) == 0)
return nullptr;
for (size_t i = 0; i < strlen(delim); ++i) {
char* delim_ptr = strchr(&str[token_start], delim[i]);
if (!delim_ptr)
continue;
size_t delim_offset = static_cast<size_t>(delim_ptr - str); ++token_end;
if (!token_end || token_end > delim_offset) if (is_proper_delim && token_end > 0) {
token_end = delim_offset; --token_end;
break;
}
} }
if (str[token_start] == '\0')
return nullptr;
if (token_end == 0) { if (token_end == 0) {
saved_str = nullptr; saved_str = nullptr;
return &str[token_start]; return &str[token_start];