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#include "all.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define STARTING_SIZE 256
#define READ_CHUNK_SIZE 1024
static void str_ensure_init(str *s) {
if (s->data)
return;
s->capacity = STARTING_SIZE;
s->length = 0;
s->data = malloc(s->capacity);
if (!s->data)
abort();
s->data[0] = '\0';
}
static void str_ensure_capacity(str *s, size_t extra) {
str_ensure_init(s);
size_t needed = s->length + extra + 1; // +1 for '\0'
if (needed <= s->capacity)
return;
while (s->capacity < needed)
s->capacity *= 2;
char *new_data = realloc(s->data, s->capacity);
if (!new_data)
abort();
s->data = new_data;
}
void free_str(str *s) {
free(s->data);
s->data = NULL;
s->length = 0;
s->capacity = 0;
}
void str_append(str *s, const char *from) {
str_append_len(s, from, strlen(from));
}
void str_append_c(str *s, char c) { str_append_len(s, &c, 1); }
void str_append_len(str *s, const char *from, size_t len) {
str_ensure_capacity(s, len);
memcpy(s->data + s->length, from, len);
s->length += len;
s->data[s->length] = '\0';
}
void str_append_read(str *s, int fd) {
char buf[READ_CHUNK_SIZE];
ssize_t n;
while ((n = read(fd, buf, sizeof(buf))) > 0) {
str_append_len(s, buf, (size_t)n);
}
}
void str_append_fread(str *s, FILE *file) {
char buf[READ_CHUNK_SIZE];
size_t n;
while ((n = fread(buf, 1, sizeof(buf), file)) > 0) {
str_append_len(s, buf, n);
}
}
void str_append_fread_len(str *s, size_t size, FILE *file) {
char buf[READ_CHUNK_SIZE];
while (size > 0) {
size_t chunk = size > sizeof(buf) ? sizeof(buf) : size;
size_t n = fread(buf, 1, chunk, file);
if (n == 0)
break;
str_append_len(s, buf, n);
size -= n;
if (n < chunk)
break;
}
}
void str_appendf(str *s, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
va_list copy;
va_copy(copy, args);
int needed = vsnprintf(NULL, 0, fmt, copy);
va_end(copy);
if (needed < 0) {
va_end(args);
return;
}
str_ensure_capacity(s, (size_t)needed);
vsnprintf(s->data + s->length, s->capacity - s->length, fmt, args);
s->length += (size_t)needed;
va_end(args);
}
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