genwrap.c 20 KB
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/* General cross-platform development wrappers */

/* $Id$ */
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// vi: tabstop=4
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/****************************************************************************
 * @format.tab-size 4		(Plain Text/Source Code File Header)			*
 * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
 *																			*
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 * Copyright Rob Swindell - http://www.synchro.net/copyright.html			*
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 *																			*
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 * This library is free software; you can redistribute it and/or			*
 * modify it under the terms of the GNU Lesser General Public License		*
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 * as published by the Free Software Foundation; either version 2			*
 * of the License, or (at your option) any later version.					*
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 * See the GNU Lesser General Public License for more details: lgpl.txt or	*
 * http://www.fsf.org/copyleft/lesser.html									*
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 *																			*
 * Anonymous FTP access to the most recent released source is available at	*
 * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net	*
 *																			*
 * Anonymous CVS access to the development source and modification history	*
 * is available at cvs.synchro.net:/cvsroot/sbbs, example:					*
 * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login			*
 *     (just hit return, no password is necessary)							*
 * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src		*
 *																			*
 * For Synchronet coding style and modification guidelines, see				*
 * http://www.synchro.net/source.html										*
 *																			*
 * You are encouraged to submit any modifications (preferably in Unix diff	*
 * format) via e-mail to mods@synchro.net									*
 *																			*
 * Note: If this box doesn't appear square, then you need to fix your tabs.	*
 ****************************************************************************/

#include <string.h>     /* strlen() */
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#include <stdarg.h>	/* vsnprintf() */
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#include <stdlib.h>		/* RAND_MAX */
#include <fcntl.h>		/* O_NOCTTY */
#include <time.h>		/* clock() */
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#include <errno.h>		/* errno */
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#include <ctype.h>		/* toupper/tolower */
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#include <limits.h>		/* CHAR_BIT */
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#include <math.h>		/* fmod */
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#if defined(__unix__)
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	#include <sys/ioctl.h>		/* ioctl() */
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	#include <sys/utsname.h>	/* uname() */
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	#include <signal.h>
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#elif defined(_WIN32)
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	#include <windows.h>
	#include <lm.h>		/* NetWkstaGetInfo() */
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#endif
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#include "genwrap.h"	/* Verify prototypes */
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#include "xpendian.h"	/* BYTE_SWAP */
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/****************************************************************************/
/* Used to replace snprintf()  guarantees to terminate.			  			*/
/****************************************************************************/
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int DLLCALL safe_snprintf(char *dst, size_t size, const char *fmt, ...)
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{
	va_list argptr;
	int     numchars;

	va_start(argptr,fmt);
	numchars= vsnprintf(dst,size,fmt,argptr);
	va_end(argptr);
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	dst[size-1]=0;
#ifdef _MSC_VER
	if(numchars==-1)
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		numchars=strlen(dst);
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#endif
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	if(numchars>=(int)size && numchars>0)
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		numchars=size-1;
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	return(numchars);
}

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/****************************************************************************/
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/* Return last character of string											*/
/****************************************************************************/
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char* DLLCALL lastchar(const char* str)
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{
	size_t	len;

	len = strlen(str);

	if(len)
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		return((char*)&str[len-1]);
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	return((char*)str);
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}

/****************************************************************************/
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/* Return character value of C-escaped (\) character						*/
/****************************************************************************/
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char DLLCALL c_unescape_char(char ch)
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{
	switch(ch) {
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		case 'e':	return(ESC);	/* non-standard */
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		case 'a':	return('\a');
		case 'b':	return('\b');
		case 'f':	return('\f');
		case 'n':	return('\n');
		case 'r':	return('\r');
		case 't':	return('\t');
		case 'v':	return('\v');
	}
	return(ch);
}

/****************************************************************************/
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/* Return character value of C-escaped (\) character literal sequence		*/
/* supports \x## (hex) and \### sequences (for octal or decimal)
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/****************************************************************************/
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char DLLCALL c_unescape_char_ptr(const char* str, char** endptr)
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{
	char	ch;

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	if(*str == 'x') {
		int digits = 0;		// \x## for hexadecimal character literals (only 2 digits supported)
		++str;
		ch = 0;
		while(digits < 2 && isxdigit(*str)) {
			ch *= 0x10;	
			ch += HEX_CHAR_TO_INT(*str);
			str++;
			digits++;
		}
#ifdef C_UNESCAPE_OCTAL_SUPPORT
	} else if(isodigit(*str)) {
		int digits = 0;		// \### for octal character literals (only 3 digits supported)
		ch = 0;
		while(digits < 3 && isodigit(*str)) {
			ch *= 8;
			ch += OCT_CHAR_TO_INT(*str);
			str++;
			digits++;
		}
#else
	} else if(isdigit(*str)) {
		int digits = 0;		// \### for decimal charater literals (only 3 digits supported)
		ch = 0;
		while(digits < 3 && isdigit(*str)) {
			ch *= 10;
			ch += DEC_CHAR_TO_INT(*str);
			str++;
			digits++;
		}
#endif
	 } else
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		ch=c_unescape_char(*(str++));
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	if(endptr!=NULL)
		*endptr=(char*)str;

	return ch;
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}

/****************************************************************************/
/* Unescape a C string, in place											*/
/****************************************************************************/
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char* DLLCALL c_unescape_str(char* str)
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{
	char	ch;
	char*	buf;
	char*	src;
	char*	dst;

	if(str==NULL || (buf=strdup(str))==NULL)
		return(NULL);

	src=buf;
	dst=str;
	while((ch=*(src++))!=0) {
		if(ch=='\\')	/* escape */
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			ch=c_unescape_char_ptr(src,&src);
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		*(dst++)=ch;
	}
	*dst=0;
	free(buf);
	return(str);
}

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char* DLLCALL c_escape_char(char ch)
{
	switch(ch) {
		case 0:		return("\\x00");
		case 1:		return("\\x01");
		case ESC:	return("\\e");		/* non-standard */
		case '\a':	return("\\a");
		case '\b':	return("\\b");
		case '\f':	return("\\f");
		case '\n':	return("\\n");
		case '\r':	return("\\r");
		case '\t':	return("\\t");
		case '\v':	return("\\v");
		case '\\':	return("\\\\");
		case '\"':	return("\\\"");
		case '\'':	return("\\'");
	}
	return(NULL);
}

char* DLLCALL c_escape_str(const char* src, char* dst, size_t maxlen, BOOL ctrl_only)
{
	const char*	s;
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	char*		d;
	const char*	e;
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	for(s=src,d=dst;*s && (size_t)(d-dst)<maxlen;s++) {
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		if((!ctrl_only || (uchar)*s < ' ') && (e=c_escape_char(*s))!=NULL) {
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			strncpy(d,e,maxlen-(d-dst));
			d+=strlen(d);
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		} else if((uchar)*s < ' ') {
			d += snprintf(d, maxlen-(d-dst), "\\x%02X", *s);
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		} else *d++=*s;
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	}
	*d=0;

	return(dst);
}

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/* Returns a byte count parsed from the 'str' argument, supporting power-of-2
 * short-hands (e.g. 'K' for kibibytes).
 * If 'unit' is specified (greater than 1), result is divided by this amount.
 * 
 * Moved from ini_file.c/parseBytes()
 */
int64_t DLLCALL parse_byte_count(const char* str, ulong unit)
{
	char*	p=NULL;
	double	bytes;

	bytes=strtod(str,&p);
	if(p!=NULL) {
		switch(toupper(*p)) {
			case 'E':
				bytes*=1024;
				/* fall-through */
			case 'P':
				bytes*=1024;
				/* fall-through */
			case 'T':
				bytes*=1024;
				/* fall-through */
			case 'G':
				bytes*=1024;
				/* fall-through */
			case 'M':
				bytes*=1024;
				/* fall-through */
			case 'K':
				bytes*=1024;
				break;
		}
	}
	return((int64_t)(unit>1 ? (bytes/unit):bytes));
}

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/* Convert a byte count to a string with a floating point value
   and a single letter multiplier/suffix.
   For values evenly divisible by 1024, no suffix otherwise.
*/
char* DLLCALL byte_count_to_str(int64_t bytes, char* str, size_t size)
{
	if(fmod((double)bytes,1024.0*1024.0*1024.0*1024.0)==0)
		safe_snprintf(str, size, "%gT",bytes/(1024.0*1024.0*1024.0*1024.0));
	else if(fmod((double)bytes,1024.0*1024.0*1024.0)==0)
		safe_snprintf(str, size, "%gG",bytes/(1024.0*1024.0*1024.0));
	else if(fmod((double)bytes,1024.0*1024.0)==0)
		safe_snprintf(str, size, "%gM",bytes/(1024.0*1024.0));
	else if(fmod((double)bytes,1024.0)==0)
		safe_snprintf(str, size, "%gK",bytes/1024.0);
	else
		safe_snprintf(str, size, "%"PRIi64, bytes);

	return str;
}

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/* Parse a duration string, default unit is in seconds */
/* (Y)ears, (W)eeks, (D)ays, (H)ours, and (M)inutes */
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/* suffixes/multipliers are supported. */
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/* Return value is in seconds */
double DLLCALL parse_duration(const char* str)
{
	char*	p=NULL;
	double	t;

	t=strtod(str,&p);
	if(p!=NULL) {
		switch(toupper(*p)) {
			case 'Y':	t*=365.0*24.0*60.0*60.0; break;
			case 'W':	t*=  7.0*24.0*60.0*60.0; break;
			case 'D':	t*=		 24.0*60.0*60.0; break;
			case 'H':	t*=			  60.0*60.0; break;
			case 'M':	t*=				   60.0; break;
		}
	}
	return t;
}

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/* Convert a duration (in seconds) to a string
 * with a single letter multiplier/suffix: 
 * (Y)ears, (W)eeks, (D)ays, (H)ours, and (M)inutes
 */
char* DLLCALL duration_to_str(double value, char* str, size_t size)
{
	if(fmod(value,365.0*24.0*60.0*60.0)==0)
		safe_snprintf(str, size, "%gY",value/(365.0*24.0*60.0*60.0));
	else if(fmod(value,7.0*24.0*60.0*60.0)==0)
		safe_snprintf(str, size, "%gW",value/(7.0*24.0*60.0*60.0));
	else if(fmod(value,24.0*60.0*60.0)==0)
		safe_snprintf(str, size, "%gD",value/(24.0*60.0*60.0));
	else if(fmod(value,60.0*60.0)==0)
		safe_snprintf(str, size, "%gH",value/(60.0*60.0));
	else if(fmod(value,60.0)==0)
		safe_snprintf(str, size, "%gM",value/60.0);
	else
		safe_snprintf(str, size, "%gS",value);

	return str;
}

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/****************************************************************************/
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/* Convert ASCIIZ string to upper case										*/
/****************************************************************************/
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#if defined(__unix__)
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char* DLLCALL strupr(char* str)
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{
	char*	p=str;

	while(*p) {
		*p=toupper(*p);
		p++;
	}
	return(str);
}
/****************************************************************************/
/* Convert ASCIIZ string to lower case										*/
/****************************************************************************/
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char* DLLCALL strlwr(char* str)
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{
	char*	p=str;

	while(*p) {
		*p=tolower(*p);
		p++;
	}
	return(str);
}
/****************************************************************************/
/* Reverse characters of a string (provided by amcleod)						*/
/****************************************************************************/
char* strrev(char* str)
{
    char t, *i=str, *j=str+strlen(str);

    while (i<j) {
        t=*i; *(i++)=*(--j); *j=t;
    }
    return str;
}
#endif

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#if !defined(__unix__)

/****************************************************************************/
/* Implementations of the recursive (thread-safe) version of strtok			*/
/* Thanks to Apache Portable Runtime (APR)									*/
/****************************************************************************/
char* DLLCALL strtok_r(char *str, const char *delim, char **last)
{
    char* token;

    if (str==NULL)      /* subsequent call */
        str = *last;    /* start where we left off */

    /* skip characters in delimiter (will terminate at '\0') */
    while(*str && strchr(delim, *str))
        ++str;

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    if(!*str) {         /* no more tokens */
		*last = str;
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        return NULL;
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	}
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    token = str;

    /* skip valid token characters to terminate token and
     * prepare for the next call (will terminate at '\0)
     */
    *last = token + 1;
    while(**last && !strchr(delim, **last))
        ++*last;

    if (**last) {
        **last = '\0';
        ++*last;
    }

    return token;
}

#endif

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/****************************************************************************/
/* Initialize (seed) the random number generator							*/
/****************************************************************************/
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void DLLCALL xp_randomize(void)
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{
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#if !(defined(HAS_SRANDOMDEV_FUNC) && defined(HAS_RANDOM_FUNC))
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	unsigned seed=~0;
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#if defined(HAS_DEV_URANDOM) && defined(URANDOM_DEV)
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	int		rf;
#endif
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#endif
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#if defined(HAS_SRANDOMDEV_FUNC) && defined(HAS_RANDOM_FUNC)
	srandomdev();
	return;
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#else
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#if defined(HAS_DEV_URANDOM) && defined(URANDOM_DEV)
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	if((rf=open(URANDOM_DEV, O_RDONLY))!=-1) {
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		read(rf, &seed, sizeof(seed));
		close(rf);
	}
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	else {
#endif
		unsigned curtime	= (unsigned)time(NULL);
		unsigned process_id = (unsigned)GetCurrentProcessId();
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		seed = curtime ^ BYTE_SWAP_INT(process_id);
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		#if defined(_WIN32) || defined(GetCurrentThreadId)
			seed ^= (unsigned)GetCurrentThreadId();
		#endif
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#if defined(HAS_DEV_URANDOM) && defined(URANDOM_DEV)
	}
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#endif

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#ifdef HAS_RANDOM_FUNC
 	srandom(seed);
#else
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 	srand(seed);
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#endif
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#endif
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}

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/****************************************************************************/
/* Return random number between 0 and n-1									*/
/****************************************************************************/
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long DLLCALL xp_random(int n)
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{
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#ifdef HAS_RANDOM_FUNC
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	long			curr;
	unsigned long	limit;
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	if(n<2)
		return(0);
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	limit = ((1UL<<((sizeof(long)*CHAR_BIT)-1)) / n) * n - 1;
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	while(1) {
		curr=random();
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		if(curr <= limit)
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			return(curr % n);
	}
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#else
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	double f=0;
	int ret;
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	if(n<2)
		return(0);
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	do {
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		f=(double)rand()/(double)(RAND_MAX+1);
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		ret=(int)(n*f);
	} while(ret==n);
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	return(ret);
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#endif
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}

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/****************************************************************************/
/* Return ASCII string representation of ulong								*/
/* There may be a native GNU C Library function to this...					*/
/****************************************************************************/
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#if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__WATCOMC__)
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char* DLLCALL ultoa(ulong val, char* str, int radix)
{
	switch(radix) {
		case 8:
			sprintf(str,"%lo",val);
			break;
		case 10:
			sprintf(str,"%lu",val);
			break;
		case 16:
			sprintf(str,"%lx",val);
			break;
		default:
			sprintf(str,"bad radix: %d",radix);
			break;
	}
	return(str);
}
#endif

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/****************************************************************************/
/* Write the version details of the current operating system into str		*/
/****************************************************************************/
char* DLLCALL os_version(char *str)
{
#if defined(__OS2__) && defined(__BORLANDC__)

	sprintf(str,"OS/2 %u.%u (%u.%u)",_osmajor/10,_osminor/10,_osmajor,_osminor);

#elif defined(_WIN32)

	/* Windows Version */
	char*			winflavor="";
	OSVERSIONINFO	winver;

	winver.dwOSVersionInfoSize=sizeof(winver);
	GetVersionEx(&winver);

	switch(winver.dwPlatformId) {
		case VER_PLATFORM_WIN32_NT:
			winflavor="NT ";
			break;
		case VER_PLATFORM_WIN32s:
			winflavor="Win32s ";
			break;
		case VER_PLATFORM_WIN32_WINDOWS:
			winver.dwBuildNumber&=0xffff;
			break;
	}

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	/* Work-around Microsoft Windows 8.1 stupidity where GetVersionEx() lies about the current OS version */
	if(winver.dwMajorVersion == 6 && winver.dwMinorVersion == 2) {
		WKSTA_INFO_100* wksta_info;
		if(NetWkstaGetInfo(NULL, 100, (LPBYTE*)&wksta_info) == NERR_Success) {
			winver.dwMajorVersion = wksta_info->wki100_ver_major;
			winver.dwMinorVersion = wksta_info->wki100_ver_minor;
			winver.dwBuildNumber = 0;
		}
	}

	sprintf(str,"Windows %sVersion %u.%u"
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			,winflavor
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			,winver.dwMajorVersion, winver.dwMinorVersion);
	if(winver.dwBuildNumber)
		sprintf(str+strlen(str), " (Build %u)", winver.dwBuildNumber);
	if(winver.szCSDVersion[0])
		sprintf(str+strlen(str), " %s", winver.szCSDVersion);
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#elif defined(__unix__)

	struct utsname unixver;

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	if(uname(&unixver)<0)
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		sprintf(str,"Unix (uname errno: %d)",errno);
	else
		sprintf(str,"%s %s %s"
			,unixver.sysname	/* e.g. "Linux" */
			,unixver.release	/* e.g. "2.2.14-5.0" */
			,unixver.machine	/* e.g. "i586" */
			);

#else	/* DOS */

	sprintf(str,"DOS %u.%02u",_osmajor,_osminor);

#endif

	return(str);
}
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char* DLLCALL os_cmdshell(void)
{
	char*	shell=getenv(OS_CMD_SHELL_ENV_VAR);

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#if defined(__unix__)
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	if(shell==NULL)
#ifdef _PATH_BSHELL
		shell=_PATH_BSHELL;
#else
		shell="/bin/sh";
#endif
#endif

	return(shell);
}

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/****************************************************************/
/* Microsoft (DOS/Win32) real-time system clock implementation.	*/
/****************************************************************/
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#ifdef __unix__
clock_t DLLCALL msclock(void)
{
	long long int usecs;
	struct timeval tv;
	if(gettimeofday(&tv,NULL)==1)
		return(-1);
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	usecs=((long long int)tv.tv_sec)*((long long int)1000000)+tv.tv_usec;
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	return((clock_t)(usecs/(1000000/MSCLOCKS_PER_SEC)));
}
#endif
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/****************************************************************************/
/* Skips all white-space chars at beginning of 'str'						*/
/****************************************************************************/
char* DLLCALL skipsp(char* str)
{
	SKIP_WHITESPACE(str);
	return(str);
}

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/****************************************************************************/
/* Truncates all white-space chars off end of 'str'	(needed by STRERRROR)	*/
/****************************************************************************/
char* DLLCALL truncsp(char* str)
{
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	size_t i,len;
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	if(str!=NULL) {
		i=len=strlen(str);
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		while(i && isspace((unsigned char)str[i-1]))
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			i--;
		if(i!=len)
			str[i]=0;	/* truncate */
	}
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	return(str);
}

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/****************************************************************************/
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/* Truncates common white-space chars off end of \n-terminated lines in		*/
/* 'dst' and retains original line break format	(e.g. \r\n or \n)			*/
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/****************************************************************************/
char* DLLCALL truncsp_lines(char* dst)
{
	char* sp;
	char* dp;
	char* src;

	if((src=strdup(dst))==NULL)
		return(dst);

	for(sp=src, dp=dst; *sp!=0; sp++) {
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		if(*sp=='\n') {
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			while(dp!=dst
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				&& (*(dp-1)==' ' || *(dp-1)=='\t' || *(dp-1)=='\r'))
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					dp--;
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			if(sp!=src && *(sp-1)=='\r')
				*(dp++)='\r';
		}
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		*(dp++)=*sp;
	}
	*dp=0;

	free(src);
	return(dst);
}

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/****************************************************************************/
/* Truncates carriage-return and line-feed chars off end of 'str'			*/
/****************************************************************************/
char* DLLCALL truncnl(char* str)
{
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	size_t i,len;
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	if(str!=NULL) {
		i=len=strlen(str);
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		while(i && (str[i-1]=='\r' || str[i-1]=='\n'))
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			i--;
		if(i!=len)
			str[i]=0;	/* truncate */
	}
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	return(str);
}
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/****************************************************************************/
/* Return errno from the proper C Library implementation					*/
/* (single/multi-threaded)													*/
/****************************************************************************/
int DLLCALL	get_errno(void)
{
	return(errno);
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}
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/****************************************************************************/
/* Returns the current value of the systems best timer (in SECONDS)			*/
/* Any value < 0 indicates an error											*/
/****************************************************************************/
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long double	DLLCALL	xp_timer(void)
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{
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	long double ret;
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#if defined(__unix__)
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	struct timeval tv;
	if(gettimeofday(&tv,NULL)==1)
		return(-1);
	ret=tv.tv_usec;
	ret /= 1000000;
	ret += tv.tv_sec;
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#elif defined(_WIN32)
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	LARGE_INTEGER	freq;
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	LARGE_INTEGER	tick;
	if(QueryPerformanceFrequency(&freq) && QueryPerformanceCounter(&tick)) {
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#if 0
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		ret=((long double)tick.HighPart*4294967296)+((long double)tick.LowPart);
		ret /= ((long double)freq.HighPart*4294967296)+((long double)freq.LowPart);
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#else
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		/* In MSVC, a long double does NOT have 19 decimals of precision */
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		ret=(((long double)(tick.QuadPart%freq.QuadPart))/freq.QuadPart);
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		ret+=tick.QuadPart/freq.QuadPart;
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#endif
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	}
	else {
		ret=GetTickCount();
		ret /= 1000;
	}
#else
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	ret=time(NULL);	/* Weak implementation */
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#endif
	return(ret);
}
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/* Returns TRUE if specified process is running */
BOOL DLLCALL check_pid(pid_t pid)
{
#if defined(__unix__)
	return(kill(pid,0)==0);
#elif defined(_WIN32)
	HANDLE	h;
	BOOL	result=FALSE;

	if((h=OpenProcess(PROCESS_QUERY_INFORMATION,/* inheritable: */FALSE, pid)) != NULL) {
		DWORD	code;
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		if(GetExitCodeProcess(h,(PDWORD)&code)==TRUE && code==STILL_ACTIVE)
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			result=TRUE;
		CloseHandle(h);
	}
	return result;
#else
	return FALSE;	/* Need check_pid() definition! */
#endif
}

/* Terminate (unconditionally) the specified process */
BOOL DLLCALL terminate_pid(pid_t pid)
{
#if defined(__unix__)
	return(kill(pid,SIGKILL)==0);
#elif defined(_WIN32)
	HANDLE	h;
	BOOL	result=FALSE;

	if((h=OpenProcess(PROCESS_TERMINATE,/* inheritable: */FALSE, pid)) != NULL) {
		if(TerminateProcess(h,255))
			result=TRUE;
		CloseHandle(h);
	}
	return result;
#else
	return FALSE;	/* Need check_pid() definition! */
#endif
}