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#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <tb/sb.h>
#define DEFAULT_CAPACITY 256
void sb_init(struct sb *ctx) {
(void)sb_init_capacity(ctx, DEFAULT_CAPACITY);
}
int sb_init_capacity(struct sb *ctx, size_t starting_capacity) {
ctx->to_ignore = 0;
ctx->length = 0;
ctx->prebuffer = 0;
ctx->string = malloc(starting_capacity);
if (NULL == ctx->string) {
ctx->capacity = 0;
return 0;
}
ctx->capacity = starting_capacity;
return 1;
}
void sb_init_buffer(struct sb *ctx, char *buffer, size_t size) {
ctx->string = buffer;
ctx->capacity = size;
ctx->length = 0;
ctx->prebuffer = 1;
ctx->to_ignore = 0;
}
void sb_free(struct sb *ctx) {
if (ctx->prebuffer) {
ctx->length = 0;
return;
}
ctx->length = 0;
ctx->capacity = 0;
free(ctx->string);
ctx->string = NULL;
}
void sb_set_ignore(struct sb *ctx, size_t n) {
ctx->to_ignore = n;
}
void sb_reset(struct sb *ctx) {
ctx->length = 0;
ctx->to_ignore = 0;
}
int sb_isempty(const struct sb *ctx) {
return (0 == ctx->length);
}
int sb_increase_buffer(struct sb *ctx, size_t min) {
if (ctx->prebuffer) {
return 0;
}
size_t new_capacity = ctx->capacity + max(32, min);
char *new_allocation = realloc(ctx->string, new_capacity);
if (!new_allocation) {
return 0;
}
ctx->string = new_allocation;
ctx->capacity = new_capacity;
return 1;
}
int sb_append_char(struct sb *ctx, char c) {
if (ctx->to_ignore > 0) {
ctx->to_ignore--;
return 1;
}
if (1 > ctx->capacity - ctx->length) {
if (!sb_increase_buffer(ctx, 1)) {
return 0;
}
}
memcpy(ctx->string + ctx->length, &c, 1);
ctx->length++;
return 1;
}
int sb_delete_right(struct sb *ctx, size_t n) {
n = min(n, ctx->length);
ctx->length -= n;
return n;
}
int sb_append(struct sb *ctx, const char *s) {
size_t l = strlen(s);
if (ctx->to_ignore >= l) {
ctx->to_ignore -= l;
return 1;
}
l -= ctx->to_ignore;
s += ctx->to_ignore;
ctx->to_ignore = 0;
if (l > ctx->capacity - ctx->length) {
if (!sb_increase_buffer(ctx, l)) {
return 0;
}
}
memcpy(ctx->string + ctx->length, s, l);
ctx->length += l;
return 1;
}
int sb_prepend_sv(struct sb *ctx, struct sv sv) {
return sb_prepend_buffer(ctx, sv.s, sv.length);
}
int sb_prepend_buffer(struct sb *ctx, const void *buffer, size_t length) {
if (ctx->to_ignore >= length) {
ctx->to_ignore -= length;
return 1;
}
length -= ctx->to_ignore;
buffer = (void *)((uintptr_t)buffer + ctx->to_ignore);
ctx->to_ignore = 0;
if (length > ctx->capacity - ctx->length) {
if (!sb_increase_buffer(ctx, length)) {
return 0;
}
}
memmove(ctx->string + length, ctx->string, ctx->length);
memcpy(ctx->string, buffer, length);
ctx->length += length;
return 1;
}
int sb_append_buffer(struct sb *ctx, const void *buffer, size_t length) {
if (ctx->to_ignore >= length) {
ctx->to_ignore -= length;
return 1;
}
length -= ctx->to_ignore;
buffer = (void *)((uintptr_t)buffer + ctx->to_ignore);
ctx->to_ignore = 0;
if (length > ctx->capacity - ctx->length) {
if (!sb_increase_buffer(ctx, length)) {
return 0;
}
}
memcpy(ctx->string + ctx->length, buffer, length);
ctx->length += length;
return 1;
}
int sb_modify_location(struct sb *ctx, void *buffer, size_t length,
size_t offset) {
if (offset + length > ctx->length) {
return 0;
}
memcpy(ctx->string + offset, buffer, length);
return 1;
}
int sb_reserve_buffer(struct sb *ctx, size_t *offset, size_t length) {
if (ctx->to_ignore > 0) {
return 0;
}
if (length > ctx->capacity - ctx->length) {
if (!sb_increase_buffer(ctx, length)) {
return 0;
}
}
if (offset) {
*offset = ctx->length;
}
ctx->length += length;
return 1;
}
int sb_append_sv(struct sb *ctx, struct sv sv) {
return sb_append_buffer(ctx, sv.s, sv.length);
}
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