61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
#include "stringv.h"
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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/*
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* @brief Create a string view from a const char* and set their lenght
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*
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* @details This string view provides a view of a string. It does not allocate
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* memory, therefore, it lives only while the source is alive. The
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* lenght is a bytes number of the string. It does not represents the number of
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* characters.
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*
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* @param str pointer from the original string. It can be NULL.
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*
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* @return a StringView with the view of original string with corresponding
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* lenght.
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*/
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#define STRING_VIEW_NULL (StringView){.text = NULL, .lenght = 0}
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StringView sv_from_cstr(const char *str) {
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if (str == NULL) {
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return STRING_VIEW_NULL;
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}
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return (StringView){.text = (char *)str, .lenght = strlen(str)};
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}
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StringView sv_left(const StringView *sv, size_t l) {
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if (sv == NULL) {
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perror("sv_left: pointer is NULL\n");
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return STRING_VIEW_NULL;
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}
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if (sv->text == NULL) {
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perror("sv_left: text pointer is NULL\n");
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return STRING_VIEW_NULL;
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}
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if (sv->lenght < l) {
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perror("sv_left: text length is less than specified length\n");
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return STRING_VIEW_NULL;
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}
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return (StringView){.text = sv->text, .lenght = l};
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}
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StringView sv_right(const StringView *sv, size_t r) {
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if (sv == NULL) {
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perror("sv_right: pointer is NULL\n");
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return STRING_VIEW_NULL;
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}
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if (sv->text == NULL) {
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perror("sv_right: text pointer is NULL\n");
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return STRING_VIEW_NULL;
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}
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if (sv->lenght < r) {
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perror("sv_right: text length is less than specified length\n");
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return STRING_VIEW_NULL;
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}
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size_t nlength = sv->lenght - r;
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return (StringView){.text = sv->text + nlength, .lenght = r};
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}
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