netsurf/utils/utils.c

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/*
* Copyright 2007 Rob Kendrick <rjek@netsurf-browser.org>
* Copyright 2004-2007 James Bursa <bursa@users.sourceforge.net>
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
* Copyright 2003 John M Bell <jmb202@ecs.soton.ac.uk>
* Copyright 2004 John Tytgat <joty@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <regex.h>
#include <time.h>
#include "utils/config.h"
#include "utils/messages.h"
#include "utils/utf8.h"
#include "utils/utils.h"
void *
ns_realloc(void *ptr, size_t size, void *pw)
{
(void)pw;
if (ptr == NULL)
return size > 0 ? malloc(size) : NULL;
if (size == 0) {
free(ptr);
return NULL;
}
return realloc(ptr, size);
}
char * strip(char * const s)
{
size_t i;
for (i = strlen(s);
i != 0 && (s[i - 1] == ' ' || s[i - 1] == '\n' ||
s[i - 1] == '\r' || s[i - 1] == '\t');
i--)
;
s[i] = 0;
return s + strspn(s, " \t\r\n");
}
int whitespace(const char * str)
{
unsigned int i;
for (i = 0; i < strlen(str); i++)
if (!isspace(str[i]))
return 0;
return 1;
}
/**
* returns a string without its underscores
* \param replacespace true to insert a space where there was an underscore
*/
char *remove_underscores(const char *s, bool replacespace)
{
size_t i, ii, len;
char *ret;
len = strlen(s);
ret = malloc(len + 1);
if (ret == NULL)
return NULL;
for (i = 0, ii = 0; i < len; i++) {
if (s[i] != '_')
ret[ii++] = s[i];
else if (replacespace)
ret[ii++] = ' ';
}
ret[ii] = '\0';
return ret;
}
/**
* Replace consecutive whitespace with a single space.
*
* \param s source string
* \return heap allocated result, or 0 on memory exhaustion
*/
char * squash_whitespace(const char *s)
{
char *c = malloc(strlen(s) + 1);
int i = 0, j = 0;
if (!c)
return 0;
do {
if (s[i] == ' ' || s[i] == '\n' || s[i] == '\r' ||
s[i] == '\t') {
c[j++] = ' ';
while (s[i] == ' ' || s[i] == '\n' || s[i] == '\r' ||
s[i] == '\t')
i++;
}
c[j++] = s[i++];
} while (s[i - 1] != 0);
return c;
}
/**
* Converts NUL terminated UTF-8 encoded string s containing zero or more
* spaces (char 32) or TABs (char 9) to non-breaking spaces
* (0xC2 + 0xA0 in UTF-8 encoding).
*
* Caller needs to free() result. Returns NULL in case of error. No
* checking is done on validness of the UTF-8 input string.
*/
char *cnv_space2nbsp(const char *s)
{
const char *srcP;
char *d, *d0;
unsigned int numNBS;
/* Convert space & TAB into non breaking space character (0xA0) */
for (numNBS = 0, srcP = (const char *)s; *srcP != '\0'; ++srcP)
if (*srcP == ' ' || *srcP == '\t')
++numNBS;
if ((d = (char *)malloc((srcP - s) + numNBS + 1)) == NULL)
return NULL;
for (d0 = d, srcP = (const char *)s; *srcP != '\0'; ++srcP) {
if (*srcP == ' ' || *srcP == '\t') {
*d0++ = 0xC2;
*d0++ = 0xA0;
} else
*d0++ = *srcP;
}
*d0 = '\0';
return d;
}
/**
* Check if a directory exists.
*/
bool is_dir(const char *path)
{
struct stat s;
if (stat(path, &s))
return false;
return S_ISDIR(s.st_mode) ? true : false;
}
/**
* Compile a regular expression, handling errors.
*
* Parameters as for regcomp(), see man regex.
*/
void regcomp_wrapper(regex_t *preg, const char *regex, int cflags)
{
int r;
r = regcomp(preg, regex, cflags);
if (r) {
char errbuf[200];
regerror(r, preg, errbuf, sizeof errbuf);
fprintf(stderr, "Failed to compile regexp '%s'\n", regex);
die(errbuf);
}
}
/** We can have a fairly good estimate of how long the buffer needs to
* be. The unsigned long can store a value representing a maximum size
* of around 4 GB. Therefore the greatest space required is to
* represent 1023MB. Currently that would be represented as "1023MB" so 12
* including a null terminator.
* Ideally we would be able to know this value for sure, in the mean
* time the following should suffice.
**/
#define BYTESIZE_BUFFER_SIZE 20
/**
* Does a simple conversion which assumes the user speaks English. The buffer
* returned is one of three static ones so may change each time this call is
* made. Don't store the buffer for later use. It's done this way for
* convenience and to fight possible memory leaks, it is not necessarily pretty.
**/
char *human_friendly_bytesize(unsigned long bsize) {
static char buffer1[BYTESIZE_BUFFER_SIZE];
static char buffer2[BYTESIZE_BUFFER_SIZE];
static char buffer3[BYTESIZE_BUFFER_SIZE];
static char *curbuffer = buffer3;
enum {bytes, kilobytes, megabytes, gigabytes} unit = bytes;
static char units[][7] = {"Bytes", "kBytes", "MBytes", "GBytes"};
float bytesize = (float)bsize;
if (curbuffer == buffer1)
curbuffer = buffer2;
else if (curbuffer == buffer2)
curbuffer = buffer3;
else
curbuffer = buffer1;
if (bytesize > 1024) {
bytesize /= 1024;
unit = kilobytes;
}
if (bytesize > 1024) {
bytesize /= 1024;
unit = megabytes;
}
if (bytesize > 1024) {
bytesize /= 1024;
unit = gigabytes;
}
sprintf(curbuffer, "%3.2f%s", bytesize, messages_get(units[unit]));
return curbuffer;
}
/**
* Create an RFC 1123 compliant date string from a Unix timestamp
*
* \param t The timestamp to consider
* \return Pointer to buffer containing string - invalidated by next call.
*/
const char *rfc1123_date(time_t t)
{
static char ret[30];
struct tm *tm = gmtime(&t);
const char *days[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" },
*months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
snprintf(ret, sizeof ret, "%s, %02d %s %d %02d:%02d:%02d GMT",
days[tm->tm_wday], tm->tm_mday, months[tm->tm_mon],
tm->tm_year + 1900, tm->tm_hour, tm->tm_min,
tm->tm_sec);
return ret;
}
/**
* Returns a number of centiseconds, that increases in real time, for the
* purposes of measuring how long something takes in wall-clock terms. It uses
* gettimeofday() for this. Should the call to gettimeofday() fail, it returns
* zero.
*
* \return number of centiseconds that increases monotonically
*/
unsigned int wallclock(void)
{
struct timeval tv;
if (gettimeofday(&tv, NULL) == -1)
return 0;
return ((tv.tv_sec * 100) + (tv.tv_usec / 10000));
}
/* Subtract the `struct timeval' values X and Y,
storing the result in RESULT.
Return 1 if the difference is negative, otherwise 0.
*/
int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
{
/* Perform the carry for the later subtraction by updating y. */
if (x->tv_usec < y->tv_usec) {
int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
y->tv_usec -= 1000000 * nsec;
y->tv_sec += nsec;
}
if (x->tv_usec - y->tv_usec > 1000000) {
int nsec = (x->tv_usec - y->tv_usec) / 1000000;
y->tv_usec += 1000000 * nsec;
y->tv_sec -= nsec;
}
/* Compute the time remaining to wait.
tv_usec is certainly positive. */
result->tv_sec = x->tv_sec - y->tv_sec;
result->tv_usec = x->tv_usec - y->tv_usec;
/* Return 1 if result is negative. */
return x->tv_sec < y->tv_sec;
}
#ifndef HAVE_STRCASESTR
/**
* Case insensitive strstr implementation
*
* \param haystack String to search in
* \param needle String to look for
* \return Pointer to start of found substring, or NULL if not found
*/
char *strcasestr(const char *haystack, const char *needle)
{
size_t needle_len = strlen(needle);
const char * last_start = haystack + (strlen(haystack) - needle_len);
while (haystack <= last_start) {
if (strncasecmp(haystack, needle, needle_len) == 0)
return (char *)haystack;
haystack++;
}
return NULL;
}
#endif
#ifndef HAVE_STRNDUP
/**
* Duplicate up to n characters of a string.
*/
char *strndup(const char *s, size_t n)
{
size_t len;
char *s2;
for (len = 0; len != n && s[len]; len++)
continue;
s2 = malloc(len + 1);
if (!s2)
return 0;
memcpy(s2, s, len);
s2[len] = 0;
return s2;
}
#endif
#ifndef HAVE_STRCHRNUL
/**
* Find the first occurrence of C in S or the final NUL byte.
*/
char *strchrnul (const char *s, int c_in)
{
const unsigned char *us = (const unsigned char *) s;
while (*us != c_in && *us != '\0')
us++;
return (void *) us;
}
#endif
#ifndef HAVE_UTSNAME
#include "utils/utsname.h"
int uname(struct utsname *buf) {
strcpy(buf->sysname,"windows");
strcpy(buf->nodename,"nodename");
strcpy(buf->release,"release");
strcpy(buf->version,"version");
strcpy(buf->machine,"pc");
return 0;
}
#endif
#ifndef HAVE_REALPATH
char *realpath(const char *path, char *resolved_path)
{
char *ret;
if (resolved_path == NULL) {
ret=strdup(path);
} else {
ret = resolved_path;
strcpy(resolved_path, path);
}
return ret;
}
#ifndef HAVE_INETATON
int inet_aton(const char *cp, struct in_addr *inp)
{
unsigned int b1, b2, b3, b4;
unsigned char c;
if (strspn(cp, "0123456789.") < strlen(cp))
return 0;
if (sscanf(cp, "%3u.%3u.%3u.%3u%c", &b1, &b2, &b3, &b4, &c) != 4)
return 0;
if ((b1 > 255) || (b2 > 255) || (b3 > 255) || (b4 > 255))
return 0;
inp->s_addr = b4 << 24 | b3 << 16 | b2 << 8 | b1;
return 1;
}
#endif
#ifndef HAVE_INETPTON
int inet_pton(int af, const char *src, void *dst)
{
int ret;
if (af == AF_INET) {
ret = inet_aton(src, dst);
}
#if !defined(NO_IPV6)
else if (af == AF_INET6) {
/* TODO: implement v6 address support */
ret = -1;
errno = EAFNOSUPPORT;
}
#endif
else {
ret = -1;
errno = EAFNOSUPPORT;
}
return ret;
}
#endif
#endif