Add dynstr_vprepend
This commit is contained in:
parent
8bd1123857
commit
c862d84d0b
73
dynstr.c
73
dynstr.c
|
@ -60,49 +60,46 @@ enum dynstr_err dynstr_append(struct dynstr *const d, const char *const format,
|
||||||
return dynstr_vappend(d, format, ap);
|
return dynstr_vappend(d, format, ap);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
enum dynstr_err dynstr_vprepend(struct dynstr *const d, const char *const format, va_list 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, ap);
|
||||||
|
d->str[src_len] = c;
|
||||||
|
}
|
||||||
|
else if (!d->len)
|
||||||
|
{
|
||||||
|
vsprintf(d->str + d->len, format, ap);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
return DYNSTR_ERR_ALLOC;
|
||||||
|
}
|
||||||
|
|
||||||
|
va_end(ap);
|
||||||
|
d->len += src_len;
|
||||||
|
return DYNSTR_OK;
|
||||||
|
}
|
||||||
|
|
||||||
enum dynstr_err dynstr_prepend(struct dynstr *const d, const char *const format, ...)
|
enum dynstr_err dynstr_prepend(struct dynstr *const d, const char *const format, ...)
|
||||||
{
|
{
|
||||||
va_list ap;
|
va_list ap;
|
||||||
|
|
||||||
va_start(ap, format);
|
va_start(ap, format);
|
||||||
|
return dynstr_vprepend(d, format, ap);
|
||||||
{
|
|
||||||
const size_t src_len = vsnprintf(NULL, 0, format, ap);
|
|
||||||
const size_t new_len = d->len + src_len + 1;
|
|
||||||
va_end(ap);
|
|
||||||
|
|
||||||
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];
|
|
||||||
}
|
|
||||||
|
|
||||||
va_start(ap, format);
|
|
||||||
vsprintf(d->str, format, ap);
|
|
||||||
va_end(ap);
|
|
||||||
d->str[src_len] = c;
|
|
||||||
}
|
|
||||||
else if (!d->len)
|
|
||||||
{
|
|
||||||
va_start(ap, format);
|
|
||||||
vsprintf(d->str + d->len, format, ap);
|
|
||||||
va_end(ap);
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
return DYNSTR_ERR_ALLOC;
|
|
||||||
}
|
|
||||||
|
|
||||||
d->len += src_len;
|
|
||||||
}
|
|
||||||
|
|
||||||
return DYNSTR_OK;
|
|
||||||
}
|
}
|
||||||
|
|
||||||
enum dynstr_err dynstr_dup(struct dynstr *const dst, const struct dynstr *const src)
|
enum dynstr_err dynstr_dup(struct dynstr *const dst, const struct dynstr *const src)
|
||||||
|
|
|
@ -134,6 +134,19 @@ enum dynstr_err dynstr_vappend(struct dynstr *d, const char *format, va_list ap)
|
||||||
*/
|
*/
|
||||||
enum dynstr_err dynstr_prepend(struct dynstr *d, const char *format, ...);
|
enum dynstr_err dynstr_prepend(struct dynstr *d, const char *format, ...);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* This function takes a string literal in printf format and a variable
|
||||||
|
* argument list, calculates its size and prepends it into the beginning of the
|
||||||
|
* dynamic string.
|
||||||
|
* @param d Dynamic string where new string will be prepended.
|
||||||
|
* @param format String literal in printf format.
|
||||||
|
* @param ap Variable argument list.
|
||||||
|
* @return Returns one of the following error codes:
|
||||||
|
* # DYNSTR_OK if successful.
|
||||||
|
* # DYNSTR_ERR_ALLOC if no more memory is available.
|
||||||
|
*/
|
||||||
|
enum dynstr_err dynstr_vprepend(struct dynstr *d, const char *format, va_list ap);
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* This function duplicates a dynamic string to another instance.
|
* This function duplicates a dynamic string to another instance.
|
||||||
* @attention Destination instance must be initialized before calling
|
* @attention Destination instance must be initialized before calling
|
||||||
|
|
Loading…
Reference in New Issue