util.c

操作系统SunOS 4.1.3版本的源码

/*
**  Sendmail
**  Copyright (c) 1983  Eric P. Allman
**  Berkeley, California
**
**  Copyright (c) 1983 Regents of the University of California.
**  All rights reserved.  The Berkeley software License Agreement
**  specifies the terms and conditions for redistribution.
*/

# include <stdio.h>
# include <sys/types.h>
# include <sys/stat.h>
# include <sysexits.h>
# include <errno.h>
# include <ctype.h>
# include "sendmail.h"

SCCSID(@(#)util.c 1.1 92/07/30 SMI); /* from UCB 5.9 12/17/86 */

/*
**  STRIPQUOTES -- Strip quotes & quote bits from a string.
**
**	Runs through a string and strips off unquoted quote
**	characters and quote bits.  This is done in place.
**
**	Parameters:
**		s -- the string to strip.
**		qf -- if set, remove actual `` " '' characters
**			as well as the quote bits.
**
**	Returns:
**		none.
**
**	Side Effects:
**		none.
**
**	Called By:
**		deliver
*/

stripquotes(s, qf)
	char *s;
	bool qf;
{
	register char *p;
	register char *q;
	register char c;

	if (s == NULL)
		return;

	for (p = q = s; (c = *p++) != '\0'; )
	{
		if (c != '"' || !qf)
			*q++ = c & 0177;
	}
	*q = '\0';
}
/*
**  QSTRLEN -- give me the string length assuming 0200 bits add a char
**
**	Parameters:
**		s -- the string to measure.
**
**	Reurns:
**		The length of s, including space for backslash escapes.
**
**	Side Effects:
**		none.
*/

qstrlen(s)
	register char *s;
{
	register int l = 0;
	register char c;

	while ((c = *s++) != '\0')
	{
		if (bitset(0200, c))
			l++;
		l++;
	}
	return (l);
}
/*
**  CAPITALIZE -- return a copy of a string, properly capitalized.
**
**	Parameters:
**		s -- the string to capitalize.
**
**	Returns:
**		a pointer to a properly capitalized string.
**
**	Side Effects:
**		none.
*/

char *
capitalize(s)
	register char *s;
{
	static char buf[50];
	register char *p;

	p = buf;

	for (;;)
	{
		while (!isalpha(*s) && *s != '\0')
			*p++ = *s++;
		if (*s == '\0')
			break;
		*p++ = toupper(*s++);
		while (isalpha(*s))
			*p++ = *s++;
	}

	*p = '\0';
	return (buf);
}
/*
**  XALLOC -- Allocate memory and bitch wildly on failure.
**
**	THIS IS A CLUDGE.  This should be made to give a proper
**	error -- but after all, what can we do?
**
**	Parameters:
**		sz -- size of area to allocate.
**
**	Returns:
**		pointer to data region.
**
**	Side Effects:
**		Memory is allocated.
*/

char *
xalloc(sz)
	register int sz;
{
	register char *p;
	extern char *malloc();

	p = malloc((unsigned) sz);
	if (p == NULL)
	{
		syserr("Out of memory!!");
		abort();
		/* exit(EX_UNAVAILABLE); */
	}
	return (p);
}
/*
**  COPYPLIST -- copy list of pointers.
**
**	This routine is the equivalent of newstr for lists of
**	pointers.
**
**	Parameters:
**		list -- list of pointers to copy.
**			Must be NULL terminated.
**		copycont -- if TRUE, copy the contents of the vector
**			(which must be a string) also.
**
**	Returns:
**		a copy of 'list'.
**
**	Side Effects:
**		none.
*/

char **
copyplist(list, copycont)
	char **list;
	bool copycont;
{
	register char **vp;
	register char **newvp;

	for (vp = list; *vp != NULL; vp++)
		continue;

	vp++;

	newvp = (char **) xalloc((int) (vp - list) * sizeof *vp);
	bcopy((char *) list, (char *) newvp, (int) (vp - list) * sizeof *vp);

	if (copycont)
	{
		for (vp = newvp; *vp != NULL; vp++)
			*vp = newstr(*vp);
	}

	return (newvp);
}
/*
**  PRINTAV -- print argument vector.
**
**	Parameters:
**		av -- argument vector.
**
**	Returns:
**		none.
**
**	Side Effects:
**		prints av.
*/

printav(av)
	register char **av;
{
	while (*av != NULL)
	{
		if (tTd(0, 44))
			printf("\n\t%08x=", *av);
		else
			(void) putchar(' ');
		xputs(*av++);
	}
	(void) putchar('\n');
}
/*
**  LOWER -- turn letter into lower case.
**
**	Parameters:
**		c -- character to turn into lower case.
**
**	Returns:
**		c, in lower case.
**
**	Side Effects:
**		none.
*/

char
lower(c)
	register char c;
{
	if (isascii(c) && isupper(c))
		c = c - 'A' + 'a';
	return (c);
}
/*
**  XPUTS -- put string doing control escapes.
**
**	Parameters:
**		s -- string to put.
**
**	Returns:
**		none.
**
**	Side Effects:
**		output to stdout
*/

xputs(s)
	register char *s;
{
#ifdef INTER
	register int c;
#else
	register char c;
#endif
	register struct metamac *m;

	if (s == NULL)
	{
		printf("<null>");
		return;
	}

	if (s[0] == MATCHREPL && isdigit(s[1]) && s[2] == '\0') {
	  printf("$%c", s[1]);
	  return;
	} else
	  for (m = MetaMacros; m->metaname != '\0'; m++)
	    if (m->metaval == *s) {
	      printf("$%c%s", m->metaname, &s[1]);
	      return;
	    }

	(void) putchar('"');
	while ((c = *s++) != '\0')
	{
#ifdef INTER
		if (!isprint(c))
		{
			(void) putchar('\\');
			c &= 0177;
		}
#else
		if (!isascii(c))
		{
			(void) putchar('\\');
			c &= 0177;
		}
		if (c < 040 || c >= 0177)
		{
			(void) putchar('^');
			c ^= 0100;
		}
#endif
		(void) putchar(c);
	}
	(void) putchar('"');
	(void) fflush(stdout);
}
/*
**  MAKELOWER -- Translate a line into lower case
**
**	Parameters:
**		p -- the string to translate.  If NULL, return is
**			immediate.
**
**	Returns:
**		none.
**
**	Side Effects:
**		String pointed to by p is translated to lower case.
**
**	Called By:
**		parse
*/

makelower(p)
	register char *p;
{
	register char c;

	if (p == NULL)
		return;
	for (; (c = *p) != '\0'; p++)
		if (isascii(c) && isupper(c))
			*p = c - 'A' + 'a';
}
/*
**  SAMEWORD -- return TRUE if the words are the same
**
**	Ignores case.
**
**	Parameters:
**		a, b -- the words to compare.
**
**	Returns:
**		TRUE if a & b match exactly (modulo case)
**		FALSE otherwise.
**
**	Side Effects:
**		none.
*/

bool
sameword(a, b)
	register char *a, *b;
{
	char ca, cb;

	do
	{
		ca = *a++;
		cb = *b++;
		if (isascii(ca) && isupper(ca))
			ca = ca - 'A' + 'a';
		if (isascii(cb) && isupper(cb))
			cb = cb - 'A' + 'a';
	} while (ca != '\0' && ca == cb);
	return (ca == cb);
}
/*
**  BUILDFNAME -- build full name from gecos style entry.
**
**	This routine interprets the strange entry that would appear
**	in the GECOS field of the password file.
**
**	Parameters:
**		p -- name to build.
**		login -- the login name of this user (for &).
**		buf -- place to put the result.
**
**	Returns:
**		none.
**
**	Side Effects:
**		none.
*/

buildfname(p, login, buf)
	register char *p;
	char *login;
	char *buf;
{
	register char *bp = buf;

	if (*p == '*')
		p++;
	while (*p != '\0' && *p != ',' && *p != ';' && *p != '%')
	{
		if (*p == '&')
		{
			(void) strcpy(bp, login);
			*bp = toupper(*bp);
			while (*bp != '\0')
				bp++;
			p++;
		}
		else
			*bp++ = *p++;
	}
	*bp = '\0';
}
/*
**  SAFEFILE -- return true if a file exists and is safe for a user.
**
**	Parameters:
**		fn -- filename to check.
**		uid -- uid to compare against.
**		mode -- mode bits that must match.
**
**	Returns:
**		TRUE if fn exists, is owned by uid, and matches mode.
**		FALSE otherwise.
**
**	Side Effects:
**		none.
*/

bool
safefile(fn, uid, mode)
	char *fn;
	int uid;
	int mode;
{
	struct stat stbuf;

	if (stat(fn, &stbuf) >= 0 && stbuf.st_uid == uid &&
	    (stbuf.st_mode & mode) == mode)
		return (TRUE);
	errno = 0;
	return (FALSE);
}
/*
**  FIXCRLF -- fix <CR><LF> in line.
**
**	Looks for the <CR><LF> combination and turns it into the
**	UNIX canonical <NL> character.  It only takes one line,
**	i.e., it is assumed that the first <NL> found is the end
**	of the line.
**
**	Parameters:
**		line -- the line to fix.
**		stripnl -- if true, strip the newline also.
**
**	Returns:
**		none.
**
**	Side Effects:
**		line is changed in place.
*/

fixcrlf(line, stripnl)
	char *line;
	bool stripnl;
{
	register char *p;

	p = index(line, '\n');
	if (p == NULL)
		return;
	if (p[-1] == '\r')
		p--;
	if (!stripnl)
		*p++ = '\n';
	*p = '\0';
}
/*
**  DFOPEN -- determined file open
**
**	This routine has the semantics of fopen, except that it will
**	keep trying a few times to make this happen.  The idea is that
**	on very loaded systems, we may run out of resources (inodes,
**	whatever), so this tries to get around it.
*/

FILE *
dfopen(filename, mode)
	char *filename;
	char *mode;
{
	register int tries;