usr/src/usr.sbin/sendmail/src/util.c

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

SCCSID(@(#)util.c       3.15            %G%);

/*
**  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';
}
\f/*
**  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);
}
\f/*
**  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 unsigned int sz;
{
        register char *p;

        p = malloc(sz);
        if (p == NULL)
        {
                syserr("Out of memory!!");
                exit(EX_UNAVAILABLE);
        }
        return (p);
}
\f/*
**  NEWSTR -- make copy of string.
**
**      Space is allocated for it using xalloc.
**
**      Parameters:
**              string to copy.
**
**      Returns:
**              pointer to new string.
**
**      Side Effects:
**              none.
*/

char *
newstr(s)
        register char *s;
{
        register char *p;

        p = xalloc((unsigned) (strlen(s) + 1));
        strcpy(p, s);
        return (p);
}
\f/*
**  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((unsigned) (vp - list) * sizeof *vp);
        bmove((char *) list, (char *) newvp, (vp - list) * sizeof *vp);

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

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

# ifdef DEBUG
printav(av)
        register char **av;
{
        while (*av != NULL)
        {
                printf("\t%08x=", *av);
                xputs(*av++);
                putchar('\n');
        }
}
# endif DEBUG
\f/*
**  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);
}
\f/*
**  XPUTS -- put string doing control escapes.
**
**      Parameters:
**              s -- string to put.
**
**      Returns:
**              none.
**
**      Side Effects:
**              output to stdout
*/

# ifdef DEBUG
xputs(s)
        register char *s;
{
        register char c;

        while ((c = *s++) != '\0')
        {
                if (!isascii(c))
                {
                        putchar('\\');
                        c &= 0177;
                }
                if (iscntrl(c))
                {
                        putchar('^');
                        c |= 0100;
                }
                putchar(c);
        }
        (void) fflush(stdout);
}
# endif DEBUG
\f/*
**  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';
}
\f/*
**  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;
{
        while (lower(*a) == lower(*b))
        {
                if (*a == '\0')
                        return (TRUE);
                a++;
                b++;
        }
        return (FALSE);
}
\f/*
**  CLEAR -- clear a block of memory
**
**      Parameters:
**              p -- location to clear.
**              l -- number of bytes to clear.
**
**      Returns:
**              none.
**
**      Side Effects:
**              none.
*/

clear(p, l)
        register char *p;
        register int l;
{
        while (l-- > 0)
                *p++ = 0;
}
\f/*
**  FULLNAME -- extract full name from a passwd file entry.
**
**      Parameters:
**              pw -- password entry to start from.
**              buf -- buffer to store result in.
**
**      Returns:
**              none.
**
**      Side Effects:
**              none.
*/

fullname(pw, buf)
        register struct passwd *pw;
        char *buf;
{
        register char *bp = buf;
        register char *p = pw->pw_gecos;

        if (*p == '*')
                p++;
        while (*p != '\0' && *p != ',' && *p != ';' && *p != '%')
        {
                if (*p == '&')
                {
                        (void) strcpy(bp, pw->pw_name);
                        *bp = toupper(*bp);
                        while (*bp != '\0')
                                bp++;
                        p++;
                }
                else
                        *bp++ = *p++;
        }
        *bp = '\0';
}
\f/*
**  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);
        return (FALSE);
}
\f/*
**  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';
}
\f/*
**  SYSLOG -- fake entry to fool lint
*/

# ifdef LOG
# ifdef lint

/*VARARGS2*/
syslog(pri, fmt, args)
        int pri;
        char *fmt;
{
        pri = *fmt;
        args = pri;
        pri = args;
}

# endif lint
# endif LOG
\f/*
**  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;
        register FILE *fp;
        extern int errno;

        for (tries = 0; tries < 10; tries++)
        {
                sleep(10 * tries);
                errno = 0;
                fp = fopen(filename, mode);
                if (fp != NULL || errno != ENFILE)
                        break;
        }
        return (fp);
}