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#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "string_view.h"
struct string_view string_view(const char *s, size_t len) {
return (struct string_view){.s = s, .len = len};
}
bool sv_equals(const struct string_view s, const char *cmp) {
return s.s && s.len == strlen(cmp) && memcmp(s.s, cmp, s.len) == 0;
}
bool sv_is_empty(const struct string_view s) {
return !s.s || s.len == 0;
}
bool sv_copy(const struct string_view s, char **output) {
if (s.s != NULL) {
char *buffer = malloc(s.len + 1);
if (!buffer) return false; // really should return TOMSG_ERR_MEMORY, but this will do
memcpy(buffer, s.s, s.len);
buffer[s.len] = '\0';
*output = buffer;
return true;
} else {
*output = NULL;
return false;
}
}
bool sv_parse_i64(const struct string_view s, int64_t *output) {
if (!s.s || s.len > 20) return false; // strlen(itoa(INT64_MIN)) == 20
char buf[21];
memcpy(buf, s.s, s.len);
buf[s.len] = '\0';
char *endp;
*output = strtoll(buf, &endp, 10);
return endp == buf + s.len;
}
struct string_view sv_tokenise_word(struct string_view *line) {
if (!line->s) return string_view(NULL, 0);
for (size_t i = 0; i < line->len; i++) {
if (line->s[i] == ' ') {
const struct string_view word = string_view(line->s, i);
line->s += i + 1;
line->len -= i + 1;
return word;
}
}
// No space found; if line is not empty, this is the final word
if (line->len > 0) {
const struct string_view word = *line;
*line = string_view(NULL, 0);
return word;
}
// Line is empty, so return NULL.
return string_view(NULL, 0);
}
void sv_skip_whitespace(struct string_view *line) {
if (!line->s) return;
while (line->len > 0 && isspace(line->s[0])) {
line->s++;
line->len--;
}
}
void sv_skip(struct string_view *line, size_t num) {
if (!line->s) return;
if (num > line->len) num = line->len;
line->s += num;
line->len -= num;
}
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