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#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "str.h"
#include "err.h"
/* strings */
void str_init(str_t *b, size_t n) {
b->buf = calloc(1, n);
if (!b->buf) {
efatal("str_init");
}
b->cap = n;
b->sz = 0;
}
/* does NOT change sz! just makes room */
void str_grow(str_t *b, size_t n) {
size_t sz = b->sz + n;
size_t c = b->cap;
if (sz > c) {
while (sz > c) c <<= 1;
char *p = realloc(b->buf, c);
if (!p) efatal("str_grow");
b->buf = p;
b->cap = c;
}
}
void str_cat(str_t *b, strv_t s) {
str_grow(b, s.n);
memcpy(&b->buf[b->sz], s.s, s.n);
b->sz += s.n;
}
void str_catc(str_t *b, char c) {
str_grow(b, 1);
b->buf[b->sz++] = c;
}
void str_free(str_t *b) {
free(b->buf);
}
/* string views */
strv_t strv(const char *s) {
return (strv_t) { s, strlen(s) };
}
int strv_split(strv_t *src, int chr, strv_t *dest) {
char *c = memchr(src->s, chr, src->n);
*dest = (strv_t) {
src->s,
c ? c - src->s : src->n
};
src->s = c ? c + 1 : &src->s[src->n];
src->n -= dest->n + !!c;
return (src->n + dest->n) > 0;
}
char strv_next(strv_t *s) {
if (s->n > 0) {
s->n--;
return *(s->s++);
} else {
return 0;
}
}
void str_fmt(str_t *b, const char *fmt, ...) {
va_list ap;
char c;
b->sz = 0;
va_start(ap, fmt);
while ((c = *fmt++)) {
if (c == '%' && *fmt) {
switch ((c = *fmt++)) {
case 'c':
str_catc(b, va_arg(ap, int));
break;
case 's':
str_cat(b, va_arg(ap, strv_t));
break;
default:
str_catc(b, c);
}
} else {
str_catc(b, c);
}
}
va_end(ap);
}
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