164 lines
3.6 KiB
C
164 lines
3.6 KiB
C
/*
|
|
Copyright 2020-2023 Xavier Del Campo Romero
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
#include "dynstr.h"
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <stdarg.h>
|
|
#include <stddef.h>
|
|
|
|
#if __STDC_VERSION__ < 199901L
|
|
#error C99 support is mandatory for dynstr
|
|
#endif /* __STDC_VERSION < 199901L */
|
|
|
|
void dynstr_init(struct dynstr *const d)
|
|
{
|
|
memset(d, 0, sizeof *d);
|
|
}
|
|
|
|
enum dynstr_err dynstr_vappend(struct dynstr *const d, const char *const format, va_list ap)
|
|
{
|
|
enum dynstr_err err = DYNSTR_OK;
|
|
va_list apc;
|
|
|
|
va_copy(apc, ap);
|
|
|
|
{
|
|
const size_t src_len = vsnprintf(NULL, 0, format, ap);
|
|
const size_t new_len = d->len + src_len + 1;
|
|
|
|
d->str = realloc(d->str, new_len * sizeof *d->str);
|
|
|
|
if (d->str)
|
|
{
|
|
vsprintf(d->str + d->len, format, apc);
|
|
d->len += src_len;
|
|
}
|
|
else
|
|
{
|
|
err = DYNSTR_ERR_ALLOC;
|
|
}
|
|
}
|
|
|
|
va_end(apc);
|
|
return err;
|
|
}
|
|
|
|
enum dynstr_err dynstr_append(struct dynstr *const d, const char *const format, ...)
|
|
{
|
|
va_list ap;
|
|
enum dynstr_err err;
|
|
|
|
va_start(ap, format);
|
|
err = dynstr_vappend(d, format, ap);
|
|
va_end(ap);
|
|
return err;
|
|
}
|
|
|
|
enum dynstr_err dynstr_vprepend(struct dynstr *const d, const char *const format, va_list ap)
|
|
{
|
|
enum dynstr_err err = DYNSTR_OK;
|
|
va_list apc;
|
|
|
|
va_copy(apc, ap);
|
|
|
|
{
|
|
const size_t src_len = vsnprintf(NULL, 0, format, ap);
|
|
const size_t new_len = d->len + src_len + 1;
|
|
|
|
d->str = realloc(d->str, new_len * sizeof *d->str);
|
|
|
|
if (d->str && d->len)
|
|
{
|
|
/* Keep byte that will be removed by later call to vsprintf. */
|
|
const char c = *d->str;
|
|
|
|
for (size_t i = new_len - 1, j = d->len; j <= d->len; i--, j--)
|
|
{
|
|
d->str[i] = d->str[j];
|
|
}
|
|
|
|
vsprintf(d->str, format, apc);
|
|
d->str[src_len] = c;
|
|
}
|
|
else if (!d->len)
|
|
{
|
|
vsprintf(d->str + d->len, format, apc);
|
|
}
|
|
else
|
|
{
|
|
err = DYNSTR_ERR_ALLOC;
|
|
}
|
|
|
|
d->len += src_len;
|
|
}
|
|
|
|
va_end(apc);
|
|
return err;
|
|
}
|
|
|
|
enum dynstr_err dynstr_prepend(struct dynstr *const d, const char *const format, ...)
|
|
{
|
|
va_list ap;
|
|
enum dynstr_err err;
|
|
|
|
va_start(ap, format);
|
|
err = dynstr_vprepend(d, format, ap);
|
|
return err;
|
|
}
|
|
|
|
enum dynstr_err dynstr_dup(struct dynstr *const dst, const struct dynstr *const src)
|
|
{
|
|
if (!dst->str && !dst->len)
|
|
{
|
|
if (src->len && src->str)
|
|
{
|
|
const size_t sz = (src->len + 1) * sizeof *dst->str;
|
|
dst->str = realloc(dst->str, sz);
|
|
|
|
if (dst->str)
|
|
{
|
|
memcpy(dst->str, src->str, sz);
|
|
dst->len = src->len;
|
|
}
|
|
else
|
|
{
|
|
return DYNSTR_ERR_ALLOC;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return DYNSTR_ERR_SRC;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return DYNSTR_ERR_INIT;
|
|
}
|
|
|
|
return DYNSTR_OK;
|
|
}
|
|
|
|
void dynstr_free(struct dynstr *const d)
|
|
{
|
|
if (d->str)
|
|
{
|
|
free(d->str);
|
|
dynstr_init(d);
|
|
}
|
|
}
|