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string_builder.c
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string_builder.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "string_builder.h"
void *
StringBuilder_malloc(size_t size)
{
void *p = malloc(size);
if (p == NULL) {
fprintf(stderr, "StringBuilder: OUT OF MEMORY\n");
exit(EXIT_FAILURE);
}
return p;
}
StringBuilder *
StringBuilder_new(void)
{
StringBuilder *sb = StringBuilder_malloc(sizeof(StringBuilder));
sb->size = 1;
sb->cap = INITIAL_CAPACITY;
char *s = StringBuilder_malloc(sizeof(char) * INITIAL_CAPACITY);
s[0] = '\0';
sb->s = s;
return sb;
}
void
StringBuilder_free(StringBuilder *sb)
{
free(sb->s);
free(sb);
}
void
StringBuilder_resize(StringBuilder *sb, size_t capacity)
{
char *s = StringBuilder_malloc(sizeof(char) * capacity);
strncpy(s, sb->s, sb->size);
free(sb->s);
sb->s = s;
sb->cap = capacity;
}
char *
StringBuilder_str(StringBuilder *sb)
{
return sb->s;
}
void
StringBuilder_write_char(StringBuilder *sb, char c)
{
size_t size = sb->size;
if (size >= sb->cap) {
StringBuilder_resize(sb, sb->cap * 2);
}
sb->s[size - 1] = c;
sb->s[size - 0] = '\0';
sb->size++;
}
void
StringBuilder_write(StringBuilder *sb, const char *s)
{
int i;
for (i = 0; s[i] != '\0'; i++) {
StringBuilder_write_char(sb, s[i]);
}
}