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/*
* Copyright (c) 2008 Nicira Networks.
*
* 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 <config.h>
#include "dynamic-string.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "timeval.h"
#include "util.h"
void
ds_init(struct ds *ds)
{
ds->string = NULL;
ds->length = 0;
ds->allocated = 0;
}
void
ds_clear(struct ds *ds)
{
ds->length = 0;
}
void
ds_truncate(struct ds *ds, size_t new_length)
{
if (ds->length > new_length) {
ds->length = new_length;
ds->string[new_length] = '\0';
}
}
void
ds_reserve(struct ds *ds, size_t min_length)
{
if (min_length > ds->allocated || !ds->string) {
ds->allocated += MAX(min_length, ds->allocated);
ds->allocated = MAX(8, ds->allocated);
ds->string = xrealloc(ds->string, ds->allocated + 1);
}
}
char *
ds_put_uninit(struct ds *ds, size_t n)
{
ds_reserve(ds, ds->length + n);
ds->length += n;
ds->string[ds->length] = '\0';
return &ds->string[ds->length - n];
}
void
ds_put_char(struct ds *ds, char c)
{
*ds_put_uninit(ds, 1) = c;
}
void
ds_put_char_multiple(struct ds *ds, char c, size_t n)
{
memset(ds_put_uninit(ds, n), c, n);
}
void
ds_put_buffer(struct ds *ds, const char *s, size_t n)
{
memcpy(ds_put_uninit(ds, n), s, n);
}
void
ds_put_cstr(struct ds *ds, const char *s)
{
size_t s_len = strlen(s);
memcpy(ds_put_uninit(ds, s_len), s, s_len);
}
void
ds_put_format(struct ds *ds, const char *format, ...)
{
va_list args;
va_start(args, format);
ds_put_format_valist(ds, format, args);
va_end(args);
}
void
ds_put_format_valist(struct ds *ds, const char *format, va_list args_)
{
va_list args;
size_t available;
int needed;
va_copy(args, args_);
available = ds->string ? ds->allocated - ds->length + 1 : 0;
needed = vsnprintf(&ds->string[ds->length], available, format, args);
va_end(args);
if (needed < available) {
ds->length += needed;
} else {
size_t available;
ds_reserve(ds, ds->length + needed);
va_copy(args, args_);
available = ds->allocated - ds->length + 1;
needed = vsnprintf(&ds->string[ds->length], available, format, args);
va_end(args);
assert(needed < available);
ds->length += needed;
}
}
void
ds_put_printable(struct ds *ds, const char *s, size_t n)
{
ds_reserve(ds, ds->length + n);
while (n-- > 0) {
unsigned char c = *s++;
if (c < 0x20 || c > 0x7e || c == '\\' || c == '"') {
ds_put_format(ds, "\\%03o", (int) c);
} else {
ds_put_char(ds, c);
}
}
}
void
ds_put_strftime(struct ds *ds, const char *template, const struct tm *tm)
{
if (!tm) {
time_t now = time_now();
tm = localtime(&now);
}
for (;;) {
size_t avail = ds->string ? ds->allocated - ds->length + 1 : 0;
size_t used = strftime(&ds->string[ds->length], avail, template, tm);
if (used) {
ds->length += used;
return;
}
ds_reserve(ds, ds->length + (avail < 32 ? 64 : 2 * avail));
}
}
int
ds_get_line(struct ds *ds, FILE *file)
{
ds_clear(ds);
for (;;) {
int c = getc(file);
if (c == EOF) {
return ds->length ? 0 : EOF;
} else if (c == '\n') {
return 0;
} else {
ds_put_char(ds, c);
}
}
}
char *
ds_cstr(struct ds *ds)
{
if (!ds->string) {
ds_reserve(ds, 0);
}
ds->string[ds->length] = '\0';
return ds->string;
}
void
ds_destroy(struct ds *ds)
{
free(ds->string);
}
/* Writes the 'size' bytes in 'buf' to 'string' as hex bytes arranged 16 per
* line. Numeric offsets are also included, starting at 'ofs' for the first
* byte in 'buf'. If 'ascii' is true then the corresponding ASCII characters
* are also rendered alongside. */
void
ds_put_hex_dump(struct ds *ds, const void *buf_, size_t size,
uintptr_t ofs, bool ascii)
{
const uint8_t *buf = buf_;
const size_t per_line = 16; /* Maximum bytes per line. */
while (size > 0)
{
size_t start, end, n;
size_t i;
/* Number of bytes on this line. */
start = ofs % per_line;
end = per_line;
if (end - start > size)
end = start + size;
n = end - start;
/* Print line. */
ds_put_format(ds, "%08jx ", (uintmax_t) ROUND_DOWN(ofs, per_line));
for (i = 0; i < start; i++)
ds_put_format(ds, " ");
for (; i < end; i++)
ds_put_format(ds, "%02hhx%c",
buf[i - start], i == per_line / 2 - 1? '-' : ' ');
if (ascii)
{
for (; i < per_line; i++)
ds_put_format(ds, " ");
ds_put_format(ds, "|");
for (i = 0; i < start; i++)
ds_put_format(ds, " ");
for (; i < end; i++) {
int c = buf[i - start];
ds_put_char(ds, c >= 32 && c < 127 ? c : '.');
}
for (; i < per_line; i++)
ds_put_format(ds, " ");
ds_put_format(ds, "|");
}
ds_put_format(ds, "\n");
ofs += n;
buf += n;
size -= n;
}
}
int
ds_last(const struct ds *ds)
{
return ds->length > 0 ? (unsigned char) ds->string[ds->length - 1] : EOF;
}
void
ds_chomp(struct ds *ds, int c)
{
if (ds->length > 0 && ds->string[ds->length - 1] == (char) c) {
ds->string[--ds->length] = '\0';
}
}
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