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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* String utility functions with dynamic memory management.
*/
/*
* Copyright 2018 Joyent, Inc.
*/
#include <stdlib.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <sys/debug.h>
#include "libcustr.h"
typedef enum {
CUSTR_FIXEDBUF = 0x01
} custr_flags_t;
struct custr {
size_t cus_strlen;
size_t cus_datalen;
char *cus_data;
custr_flags_t cus_flags;
};
#define STRING_CHUNK_SIZE 64
void
custr_reset(custr_t *cus)
{
if (cus->cus_data == NULL)
return;
cus->cus_strlen = 0;
cus->cus_data[0] = '\0';
}
size_t
custr_len(custr_t *cus)
{
return (cus->cus_strlen);
}
const char *
custr_cstr(custr_t *cus)
{
if (cus->cus_data == NULL) {
VERIFY(cus->cus_strlen == 0);
VERIFY(cus->cus_datalen == 0);
/*
* This function should never return NULL. If no buffer has
* been allocated, return a pointer to a zero-length string.
*/
return ("");
}
return (cus->cus_data);
}
int
custr_append_vprintf(custr_t *cus, const char *fmt, va_list ap)
{
int len = vsnprintf(NULL, 0, fmt, ap);
size_t chunksz = STRING_CHUNK_SIZE;
if (len == -1)
return (len);
while (chunksz < len) {
chunksz *= 2;
}
if (len + cus->cus_strlen + 1 >= cus->cus_datalen) {
char *new_data;
size_t new_datalen = cus->cus_datalen + chunksz;
if (cus->cus_flags & CUSTR_FIXEDBUF) {
errno = EOVERFLOW;
return (-1);
}
/*
* Allocate replacement memory:
*/
if ((new_data = malloc(new_datalen)) == NULL) {
return (-1);
}
/*
* Copy existing data into replacement memory and free
* the old memory.
*/
if (cus->cus_data != NULL) {
(void) memcpy(new_data, cus->cus_data,
cus->cus_strlen + 1);
free(cus->cus_data);
}
/*
* Swap in the replacement buffer:
*/
cus->cus_data = new_data;
cus->cus_datalen = new_datalen;
}
/*
* Append new string to existing string:
*/
len = vsnprintf(cus->cus_data + cus->cus_strlen,
(uintptr_t)cus->cus_data - (uintptr_t)cus->cus_strlen, fmt, ap);
if (len == -1)
return (len);
cus->cus_strlen += len;
return (0);
}
int
custr_appendc(custr_t *cus, char newc)
{
return (custr_append_printf(cus, "%c", newc));
}
int
custr_append_printf(custr_t *cus, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = custr_append_vprintf(cus, fmt, ap);
va_end(ap);
return (ret);
}
int
custr_append(custr_t *cus, const char *name)
{
return (custr_append_printf(cus, "%s", name));
}
int
custr_alloc(custr_t **cus)
{
custr_t *t;
if ((t = calloc(1, sizeof (*t))) == NULL) {
*cus = NULL;
return (-1);
}
*cus = t;
return (0);
}
int
custr_alloc_buf(custr_t **cus, void *buf, size_t buflen)
{
int ret;
if (buflen == 0 || buf == NULL) {
errno = EINVAL;
return (-1);
}
if ((ret = custr_alloc(cus)) != 0)
return (ret);
(*cus)->cus_data = buf;
(*cus)->cus_datalen = buflen;
(*cus)->cus_strlen = 0;
(*cus)->cus_flags = CUSTR_FIXEDBUF;
(*cus)->cus_data[0] = '\0';
return (0);
}
void
custr_free(custr_t *cus)
{
if (cus == NULL)
return;
if ((cus->cus_flags & CUSTR_FIXEDBUF) == 0)
free(cus->cus_data);
free(cus);
}
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