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#include <lib/sv.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
struct string_view sv_create(const char *buf, const size_t len)
{
return (struct string_view){.buf = buf, .len = len};
}
int sv_init(struct string_view *sv, const char *b)
{
assert(sv != NULL);
size_t len = strlen(b);
void *ptr = malloc(len);
memcpy(ptr, b, len);
sv->buf = ptr;
sv->len = len;
return 0;
}
void sv_free(struct string_view *sv)
{
assert(sv != NULL);
free(sv->buf);
}
/**
* @warning User's responsibility to cleanup memory.
*/
struct string_view sv_copy(struct string_view *sv)
{
assert(sv != NULL);
struct string_view copy = { 0 };
copy.buf = malloc(sv->len);
copy.len = sv->len;
memcpy(copy.buf, sv->buf, sv->len);
return copy;
}
int sv_equal(struct string_view *a, struct string_view *b)
{
assert(a != NULL);
assert(b != NULL);
if (a->buf == NULL || b->buf == NULL)
return 0;
if (a->len != b->len)
return 0;
if (memcmp(a->buf, b->buf, a->len) != 0)
return 0;
return 1;
}
/**
* @warning User's responsibility to cleanup memory.
*/
struct string_view sv_concat(struct string_view *a, struct string_view *b)
{
assert(a != NULL);
assert(b != NULL);
size_t nlen = a->len + b->len;
char *ptr = malloc(nlen);
return (struct string_view){.buf = ptr, .len = nlen};
}
int sv_concat_cstr(struct string_view *a, const char *cstr)
{
assert(a != NULL);
if (a->len > 0 && a->buf[a->len - 1] == '\0')
a->len--;
size_t lenb = strlen(cstr);
size_t nlen = lenb + a->len + 1;
char *tmp = realloc(a->buf, nlen);
if (tmp == NULL)
return -1;
a->buf = tmp;
memcpy(a->buf + a->len, cstr, lenb);
a->len = nlen - 1;
a->buf[a->len] = '\0';
return 0;
}
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