55 lines
1021 B
C
55 lines
1021 B
C
#include <stddef.h>
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#include "str.h"
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static bool intToIndex(String string, int i, size_t *out_index) {
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int val = 0;
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bool is_ok = true;
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if (i >= 0) {
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val = i;
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} else {
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val = string.size + 1 + i;
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}
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if (val < 0) {
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val = 0;
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is_ok = false;
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} else if (val > string.size) {
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val = string.size;
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is_ok = false;
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}
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*out_index = val;
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return is_ok;
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}
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bool StringSub(String string, int start, int end, String *out_substr) {
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size_t start_index = 0;
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bool start_ok = intToIndex(string, start, &start_index);
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size_t end_index = 0;
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bool end_ok = intToIndex(string, end, &end_index);
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if (string.size == 0 || start_index >= end_index) {
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out_substr->size=0;
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out_substr->buffer=NULL;
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return false;
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}
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out_substr->buffer = &string.buffer[start_index];
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out_substr->size = end_index - start_index;
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return start_ok && end_ok;
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}
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// TODO: foobar
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String StringFromCString(unsigned char const *s) {
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size_t size = 0;
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while (s[size] != '\0') { size++; }
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return (String) {
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.buffer=s,
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.size=size,
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};
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}
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