82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
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#include <merror.h>
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#include <stdlib.h>
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#include "lex.h"
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/* init a empty string buffer */
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inline void string_init(struct string *string)
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{
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string->len = 0;
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string->size = 0;
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string->allocated = true;
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string->str = NULL;
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}
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/* free a string buffer */
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inline void string_free(struct string *string)
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{
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if (string->allocated && string->str)
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free(string->str);
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}
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/* clone a string buffer */
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inline int string_clone(struct string *dst, const struct string *const src)
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{
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dst->len = src->len;
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dst->size = src->len;
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dst->allocated = src->allocated;
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/// bss strings do not need to be
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/// malloced or copied
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if (src->allocated == false) {
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dst->str = src->str;
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return M_SUCCESS;
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}
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dst->str = malloc(sizeof(char) * src->len);
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if (dst->str == NULL) {
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PERROR("cannot alloc");
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return M_ERROR;
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}
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memcpy(dst->str, src->str, sizeof(char) * src->len);
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return M_SUCCESS;
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}
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/* moves a string */
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inline void string_move(struct string *dst, struct string *src)
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{
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dst->len = src->len;
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dst->size = src->len;
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dst->allocated = src->allocated;
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dst->str = src->str;
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// delete ptr in src
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src->str = NULL;
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}
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/* pushes a char onto a string */
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int string_push(struct string *string, char c)
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{
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if (string->len >= string->size) {
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int len = string->size ? string->size * 2 : 8;
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char *new = realloc(string->str, sizeof(char) + len);
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if (new == NULL) {
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PERROR("cannot realloc");
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return M_ERROR;
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}
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string->size = len;
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string->str = new;
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}
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string->str[string->len++] = c;
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return M_SUCCESS;
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}
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void string_bss(struct string *string, char *src)
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{
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int len = strlen(src);
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string->str = src;
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string->len = len;
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string->size = len;
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string->allocated = false;
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}
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