Power-Programmierung/CD2.mdf/c/library/os2/less/termcap.c

C/C++ Source or Header | 1991-06-27 | 28.2 KB | 1,298 lines

/************************************************************************
 *                                    *
 *            Copyright (c) 1982, Fred Fish            *
 *                All Rights Reserved                *
 *                                    *
 *    This software and/or documentation is released for public    *
 *    distribution for personal, non-commercial use only.        *
 *    Limited rights to use, modify, and redistribute are hereby    *
 *    granted for non-commercial purposes, provided that all        *
 *    copyright notices remain intact and all changes are clearly    *
 *    documented.  The author makes no warranty of any kind with    *
 *    respect to this product and explicitly disclaims any implied    *
 *    warranties of merchantability or fitness for any particular    *
 *    purpose.                            *
 *                                    *
 ************************************************************************
 */

#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>

#include "termcap.h"

static char *fgetlr(char *bp, int bpsize, FILE *fp);
static FILE *find_file(char *bp);
static gotcha(char *bp, char *name);
static char *decode(char *bp, char **area);
static char *do_esc(char *out, char *in);
static void process(void);

#define TRUE 1
#define FALSE 0
#define BUFSIZE 1024            /* Assumed size of external buffer */

#define NO_FILE     -1            /* Returned if can't open file */
#define NO_ENTRY  0            /* Returned if can't find entry */
#define SUCCESS   1            /* Returned if entry found ok */
#define TRUNCATED 2            /* Returned if entry found but trunc */

# ifdef DGK
# define DEFAULT_ROOT "termcap.cnf"        /* name without path component */
  FILE *fopenp();
# endif

# ifdef MSDOS
# define DEFAULT_FILE "termcap.dat"
# else
# define DEFAULT_FILE "/etc/termcap"    /* default termcap filename */
# endif

char *_tcpbuf;                          /* Place to remember buffer pointer */

# ifdef MSDOS
# define index strchr
# endif


/*
 *  LIBRARY FUNCTION
 *
 *    fgetlr    get logical record from a file
 *
 *  KEY WORDS
 *
 *    fgetlr
 *    string functions
 *
 *  SYNOPSIS
 *
 *    char *fgetlr(bp,bpsize,fp)
 *    char *bp;
 *    int bpsize;
 *    FILE *fp;
 *
 *  DESCRIPTION
 *
 *    Reads the next logical record from stream "fp" into buffer "bp"
 *    until next unescaped newline, "bpsize" minus one characters
 *    have been read, end of file, or read error.
 *    The last character read is followed by a NULL.
 *
 *    A logical record may span several physical records by having
 *    each newline escaped with the standard C escape character
 *    (backslash).
 *
 *    This is particularly useful for things like the termcap
 *    file, where a single entry is too long for one physical
 *    line, yet needs to be treated as a single record.
 *
 *    Returns its first argument unless an end of file or read
 *    error occurs prior to any characters being read.
 *
 *  BUGS
 *
 *    The only way to know if read was terminated due to buffer size
 *    limitation is to test for a newline before the terminating
 *    null.
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin fgetlr
 *        If read fails then
 *        Return NULL.
 *        Else
 *        Find out how many characters were read.
 *        Initialize pointer to terminating null.
 *        If last char read was newline then
 *            If newline was escaped then
 *            Replace backslash with the newline.
 *            Replace newline with null.
 *            Read and append more.
 *            End if
 *        End if
 *        Return buffer pointer.
 *        End if
 *    End fgetlr
 *
 */

static char *fgetlr(bp,bpsize,fp)
char *bp;
int bpsize;
FILE *fp;
{
    int numch;
    char *cp;

    if (fgets(bp,bpsize,fp) == NULL) {
    return(NULL);
    } else {
    numch = strlen(bp);
    cp = &bp[numch];
    if (*--cp == '\n') {
        if (numch > 1 && *--cp == '\\') {
        *cp++ = '\n';
        *cp = 0;
        fgetlr(cp,bpsize-numch+1,fp);
        }
    }
    return(bp);
    }
}


#ifndef isdigit
/*
 *  LIBRARY FUNCTION
 *
 *    isdigit    test character for numeric property
 *
 *  SYNOPSIS
 *
 *    int isdigit(ch)
 *    char ch;
 *
 *  DESCRIPTION
 *
 *    Returns TRUE or FALSE depending upon whether the specified
 *    character is a numeric character or not.
 *
 *  BUGS
 *
 *    May fail on machines in which native character set is not ASCII.
 *
 */

int isdigit(ch)
char ch;
{
    if (ch > '9' || ch < '0') {
    return(FALSE);
    } else {
    return(TRUE);
    }
}
#endif


/*
 *  LIBRARY FUNCTION
 *
 *    tgetent   load buffer with entry for specified terminal
 *
 *  KEY WORDS
 *
 *    termcap functions
 *    utility routines
 *
 *  SYNOPSIS
 *
 *    int tgetent(bp,name)
 *    char *bp;
 *    char *name;
 *
 *  DESCRIPTION
 *
 *    Extracts the entry for terminal <name> from the termcap file
 *    and places it in the character buffer <bp>.   It is currently
 *    assumed that bp is at least 1024 characters.  If the entry in
 *    the termcap file is larger than 1023 characters the excess
 *    characters will be discarded and appropriate status will
 *    be returned.
 *
 *    Also note that since bp is used by other termcap
 *    routines, the storage associated with the termcap entry
 *    cannot be freed until all termcap calls are completed.
 *
 *    Tgetent can be directed to look in a file other than
 *    the default (/etc/termcap) by defining an environment
 *    variable called TERMCAP to be the pathname of the desired
 *    termcap file.  This is useful for debugging new entries.
 *    NOTE: the pathname MUST begin with a '/' character.
 *
 *    Also, if the string assigned to TERMCAP does not begin with
 *    a '/' and if the environment variable TERM matches <name> then
 *    the string assigned to TERMCAP is copied to buffer <bp>
 *    instead of reading a termcap file.
 *
 *  RETURNS
 *
 *    -1  if the termcap file cannot be opened
 *     0  if no entry in termcap file matches <name>
 *     1  if extraction is successful with no errors
 *     2  if extraction is successful but entry truncated
 *
 *  SEE ALSO
 *
 *    tgetnum   extract numeric type capability
 *    tgetflag  test boolean type capability
 *    tgetstr   get string value of capability
 *
 *  AUTHOR
 *
 *    Fred Fish
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin tgetent
 *        Erase any previous buffer contents.
 *        Remember the buffer pointer.
 *        If termcap file is not found then
 *        If buffer was filled anyway then
 *            Return SUCCESS.
 *        Else
 *            Return NO_FILE.
 *        End if
 *        Else
 *        While records left to process
 *            If this is entry is what we want then
 *            Close the termcap file.
 *            If entry was truncated then
 *                Return TRUNCATED status
 *            Else
 *                Return SUCCESS status.
 *            End if
 *            End if
 *        End while
 *        Return NO_ENTRY status.
 *        End if
 *    End tgetent
 *
 */

int tgetent(bp,name)
char *bp;                /* Pointer to buffer (1024 char min) */
char *name;                /* Pointer to terminal entry to find */
{
    FILE *fp;

    *bp = 0;
    _tcpbuf = bp;
    if ((fp = find_file(bp)) == NULL) {
    if (*bp != 0) {
        return(SUCCESS);
    } else {
        return(NO_FILE);
    }
    } else {
    while (fgetlr(bp,BUFSIZE,fp)) {
        if (gotcha(bp,name)) {
        fclose(fp);
        if (bp[strlen(bp)-1] != '\n') {
            return(TRUNCATED);
        } else {
            return(SUCCESS);
        }
        }
    }
    return(NO_ENTRY);
    }
}

/*
 *  INTERNAL FUNCTION
 *
 *    find_file    find the termcap file and open it if possible
 *
 *  KEY WORDS
 *
 *    internal functions
 *    find_file
 *
 *  SYNOPSIS
 *
 *    static FILE *find_file(bp)
 *    char *bp;
 *
 *  DESCRIPTION
 *
 *    Attempts to locate and open the termcap file.  Also handles
 *    using the environment TERMCAP string as the actual buffer
 *    (that's why bp has to be an input parameter).
 *
 *    If TERMCAP is defined an begins with a '/' character then
 *    it is taken to be the pathname of the termcap file and
 *    an attempt is made to open it.  If this fails then
 *    the default termcap file is used instead.
 *
 *    If TERMCAP is defined but does not begin with a '/' then
 *    it is assumed to be the actual buffer contents provided
 *    that <name> matches the environment variable TERM.
 *
 *  BUGS
 *
 *    There is currently no way to be sure which termcap
 *    file was opened since the default will always be
 *    tried.
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin find_file
 *        If there is a TERMCAP environment string then
 *        If the string is not null then
 *            If the string is a pathname then
 *            If that file is opened successfully then
 *                Return its pointer.
 *            End if
 *            Else
 *            If there is a TERM environment string then
 *                If TERM matches <name> then
 *                Copy TERMCAP string to buffer.
 *                Return NULL for no file.
 *                End if
 *            End if
 *            End if
 *        End if
 *        End if
 *        Open default termcap file and return results.
 *    End find_file
 *
 */

static FILE *find_file(bp)
char *bp;
{
    FILE *fp;
    char *cp, *ncp;

    if ((cp = getenv("TERMCAP")) != NULL) {
    if (*cp != 0) {
        if (*cp == '/' || *cp == '\\') {
        if ((fp = fopen(cp,"r")) != NULL) {
            return(fp);
        }
        } else {
        if ((ncp = getenv("TERM")) != NULL) {
            if (strcmp(cp,ncp) == 0) {
            strcpy(bp,cp);
            return((FILE *)NULL);
            }
        }
        }
    }
    }
# ifdef DGK
    /* Try current directory, then /etc/termcap, then along the path
     */
    if (fp = fopen(DEFAULT_ROOT, "r"))
        return fp;
    else if (fp = fopen(DEFAULT_FILE, "r"))
        return fp;
    else
        return fopenp(DEFAULT_ROOT, "r", NULL);
# else
# ifdef MSDOS
  {
    char path[128];

    _searchenv(DEFAULT_FILE, "INIT", path);
    if ( path[0] == 0 )
      _searchenv(DEFAULT_FILE, "PATH", path);

    return(fopen(path,"r"));
  }
# else
    return(fopen(DEFAULT_FILE,"r"));
# endif
# endif
}

/*
 *  INTERNAL FUNCTION
 *
 *    gotcha   test to see if entry is for specified terminal
 *
 *  SYNOPSIS
 *
 *    gotcha(bp,name)
 *    char *bp;
 *    char *name;
 *
 *  DESCRIPTION
 *
 *    Tests to see if the entry in buffer bp matches the terminal
 *    specified by name.  Returns TRUE if match is detected, FALSE
 *    otherwise.
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin gotcha
 *        If buffer character is comment character then
 *        Return FALSE since remainder is comment
 *        Else
 *        Initialize name scan pointer.
 *        Compare name and buffer until end or mismatch.
 *        If valid terminators for both name and buffer strings
 *            Return TRUE since a match was found.
 *        Else
 *            Find next non-name character in buffer.
 *            If not an alternate name separater character
 *            Return FALSE since no more names to check.
 *            Else
 *            Test next name and return results.
 *            End if
 *        End if
 *        End if
 *    End gotcha
 *
 */

static int gotcha(bp,name)
char *bp;
char *name;
{
    char *np;

    if (*bp == '#') {
    return(FALSE);
    } else {
    np = name;
    while (*np == *bp && *np != 0) {np++; bp++;}
    if (*np == 0 && (*bp == 0 || *bp == '|' || *bp == ':')) {
        return(TRUE);
    } else {
        while (*bp != 0 && *bp != ':' && *bp != '|') {bp++;}
        if (*bp != '|') {
        return(FALSE);
        } else {
        return(gotcha(++bp,name));
        }
    }
    }
}


/*
 *  LIBRARY FUNCTION
 *
 *    tgetflag   extract boolean termcap capability
 *
 *  KEY WORDS
 *
 *    termcap
 *
 *  SYNOPSIS
 *
 *    tgetflag(id)
 *    char *id;
 *
 *  DESCRIPTION
 *
 *    Returns TRUE if specified id is present in terminal
 *    entry, FALSE otherwise.
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin tgetflag
 *        Initialize pointer to the termcap entry buffer.
 *        While there is a field to process
 *        Skip over the field separator character.
 *        If this is the entry we want then
 *            If entry is identifier only then
 *            Return TRUE
 *            Else
 *            Return FALSE
 *            End if
 *        End if
 *        End while
 *        Return FALSE as default.
 *    End tgetflag
 *
 */

tgetflag(id)
char *id;
{
    char *bp;

    bp = _tcpbuf;
    while ((bp = index(bp,':')) != NULL) {
    bp++;
    if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
        if (*bp == 0 || *bp++ == ':') {
        return(TRUE);
        } else {
        return(FALSE);
        }
    }
    }
    return(FALSE);
}


/*
 *  LIBRARY FUNCTION
 *
 *    tgetnum   extract numeric option from termcap entry
 *
 *  KEY WORDS
 *
 *    termcap
 *    ce functions
 *
 *  SYNOPSIS
 *
 *    tgetnum(id)
 *    char *id;
 *
 *  DESCRIPTION
 *
 *    Returns numeric value of capability <id>, or -1 if <id>
 *    is not found.   Knows about octal numbers, which
 *    begin with 0.
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin tgetnum
 *        Initialize pointer to the termcap entry buffer.
 *        While there is a field to process
 *        Skip over the field separator character.
 *        If this is the entry we want then
 *            If the entry is not a numeric then
 *            Return failure value.
 *            Else
 *            Initialize value to zero.
 *            If number begins with zero then
 *                Set accumulation base to 8.
 *            Else
 *                Set accumulation base to 10.
 *            End if
 *            While there is a numeric character
 *                Accumulate the value.
 *            End while
 *            Return value.
 *            End if
 *        End if
 *        End while
 *        Return failure value.
 *    End tgetnum
 *
 */

tgetnum(id)
char *id;
{
    int value, base;
    char *bp;

    bp = _tcpbuf;
    while ((bp = index(bp,':')) != NULL) {
    bp++;
    if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
        if (*bp != 0 && *bp++ != '#') {
        return(-1);
        } else {
        value = 0;
        if (*bp == '0') {
            base = 8;
        } else {
            base = 10;
        }
        while (isdigit(*bp)) {
            value *= base;
            value += (*bp++ - '0');
        }
        return(value);
        }
    }
    }
    return(-1);
}


/*
 *  LIBRARY FUNCTION
 *
 *    tgetstr   extract string capability from termcap entry
 *
 *  KEY WORDS
 *
 *    termcap
 *
 *  SYNOPSIS
 *
 *    char *tgetstr(id,area)
 *    char *id;
 *    char **area;
 *
 *  DESCRIPTION
 *
 *    Gets the string capability for <id>, placing it in
 *    the buffer at *area, and advancing *area to point
 *    to next available storage.
 *
 *    For example, if the following capabilities are
 *    in the termcap file:
 *
 *        ZZ=zzzz
 *        YY=yyyyyy
 *        WW=www
 *
 *    then successive calls using YY, ZZ, and WW will
 *    build the following buffer:
 *
 *        yyyyyy0zzzz0www0
 *
 *    The first call will return a pointer to yyyyyy, the
 *    second will return a pointer to zzzz and the third
 *    will return a pointer to www.  Note that each
 *    string is null terminated, as are all C strings.
 *
 *    Characters preceded by the carot character (\136)
 *    are mapped into the corresponding control character.
 *    For example, the two character sequence ^A becomes
 *    a single control-A (\001) character.
 *
 *    The escape character is the normal C backslash and
 *    the normal C escape sequences are recognized, along
 *    with a special sequence for the ASCII escape character
 *    (\033).  The recognized sequences are:
 *
 *        \E   =>  '\033'  (ASCII escape character)
 *        \b   =>  '\010'  (ASCII backspace character)
 *        \f   =>  '\014'  (ASCII form feed character)
 *        \n   =>  '\012'  (ASCII newline/linefeed char)
 *        \r   =>  '\015'  (ASCII carriage return char)
 *        \t   =>  '\011'  (ASCII tab character)
 *        \ddd =>  '\ddd'  (arbitrary ASCII digit)
 *        \x   =>  'x'     (ordinary ASCII character)
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin tgetstr
 *        Initialize pointer to the termcap entry buffer.
 *        While there is a field to process
 *        Skip over the field separator character.
 *        If this is the entry we want then
 *            If the entry is not a string then
 *            Return NULL.
 *            Else
 *            Transfer string and rtn pointer.
 *            End if
 *        End if
 *        End while
 *        Return NULL
 *    End tgetstr
 *
 */

char *tgetstr(id,area)
char *id;
char **area;
{
    char *bp;
    char *decode();

    bp = _tcpbuf;
    while ((bp = index(bp,':')) != NULL) {
    bp++;
    if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
        if (*bp != 0 && *bp++ != '=') {
        return(NULL);
        } else {
        return(decode(bp,area));
        }
    }
    }
    return(NULL);
}

/*
 *  INTERNAL FUNCTION
 *
 *    decode   transfer string capability, decoding escapes
 *
 *  SYNOPSIS
 *
 *    static char *decode(bp,area)
 *    char *bp;
 *    char **area;
 *
 *  DESCRIPTION
 *
 *    Transfers the string capability, up to the next ':'
 *    character, or null, to the buffer pointed to by
 *    the pointer in *area.  Note that the initial
 *    value of *area and *area is updated to point
 *    to the next available location after the null
 *    terminating the transfered string.
 *
 *  BUGS
 *
 *    There is no overflow checking done on the destination
 *    buffer, so it better be large enough to hold
 *    all expected strings.
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin decode
 *        Initialize the transfer pointer.
 *        While there is an input character left to process
 *        Switch on input character
 *        Case ESCAPE:
 *            Decode and xfer the escaped sequence.
 *            Break
 *        Case CONTROLIFY:
 *            Controlify and xfer the next character.
 *            Advance the buffer pointer.
 *            Break
 *        Default:
 *            Xfer a normal character.
 *        End switch
 *        End while
 *        Null terminate the output string.
 *        Remember where the output string starts.
 *        Update the output buffer pointer.
 *        Return pointer to the output string.
 *    End decode
 *
 */

static char *decode(bp,area)
char *bp;
char **area;
{
    char *cp, *bgn;
    char *do_esc();

    cp = *area;
    while (*bp != 0 && *bp != ':') {
    switch(*bp) {
    case '\\':
        bp = do_esc(cp++,++bp);
        break;
    case '^':
        *cp++ = (char) (*++bp & 037);
        bp++;
        break;
    default:
        *cp++ = *bp++;
        break;
    }
    }
    *cp++ = 0;
    bgn = *area;
    *area = cp;
    return(bgn);
}

/*
 *  INTERNAL FUNCTION
 *
 *    do_esc    process an escaped sequence
 *
 *  SYNOPSIS
 *
 *    char *do_esc(out,in);
 *    char *out;
 *    char *in;
 *
 *  DESCRIPTION
 *
 *    Processes an escape sequence pointed to by
 *    in, transfering it to location pointed to
 *    by out, and updating the pointer to in.
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin do_esc
 *        If the first character is not a NULL then
 *        If is a digit then
 *            Set value to zero.
 *            For up to 3 digits
 *                Accumulate the sum.
 *            End for
 *            Transfer the sum.
 *            Else if character is in remap list then
 *            Transfer the remapped character.
 *            Advance the input pointer once.
 *            Else
 *            Simply transfer the character.
 *            End if
 *        End if
 *        Return updated input pointer.
 *    End do_esc
 *
 */

static char *maplist = {
    "E\033b\bf\fn\nr\rt\t"
};

char *do_esc(out,in)
char *out;
char *in;
{
    int count;
    char ch;
    char *cp;

    if (*in != 0) {
    if (isdigit(*in)) {
        ch = 0;
        for (count = 0; count < 3 && isdigit(*in); in++) {
         ch <<= 3;
         ch |= (*in - '0');
        }
        *out++ = ch;
    } else if ((cp = index(maplist,*in)) != NULL) {
        *out++ = *++cp;
        in++;
    } else {
        *out++ = *in++;
    }
    }
    return(in);
}


/*
 *  LIBRARY FUNCTION
 *
 *    tgoto   expand cursor addressing string from cm capability
 *
 *  KEY WORDS
 *
 *    termcap
 *
 *  SYNOPSIS
 *
 *    char *tgoto(cm,destcol,destline)
 *    char *cm;
 *    int destcol;
 *    int destline;
 *
 *  DESCRIPTION
 *
 *    Returns cursor addressing string, decoded from the cm
 *    capability string, to move cursor to column destcol on
 *    line destline.
 *
 *    The following sequences uses one input argument, either
 *    line or column, and place the appropriate substitution
 *    in the output string:
 *
 *        %d    substitute decimal value (in ASCII)
 *        %2    like %d but forces field width to 2
 *        %3    like %d but forces field width to 3
 *        %.    like %c
 *        %+x    like %c but adds ASCII value of x
 *
 *    The following sequences cause processing modifications
 *    but do not "use up" one of the arguments.  If they
 *    act on an argument they act on the next one to
 *    be converted.
 *
 *        %>xy    if next value to be converted is
 *            greater than value of ASCII char x
 *            then add value of ASCII char y.
 *        %r    reverse substitution of line
 *            and column (line is substituted
 *            first by default).
 *        %i    causes input values destcol and
 *            destline to be incremented.
 *        %%    gives single % character in output.
 *
 *  BUGS
 *
 *    Does not implement some of the more arcane sequences for
 *    radically weird terminals (specifically %n, %B, & %D).
 *    If you have one of these you deserve whatever happens.
 *
 */

#define MAXARGS 2

static char *in;        /* Internal copy of input string pointer */
static char *out;        /* Pointer to output array */
static int args[MAXARGS];    /* Maximum number of args to convert */
static int pcount;        /* Count of args processed */
static char output[64];        /* Converted string */

/*
 *  PSEUDO CODE
 *
 *    Begin tgoto
 *        If no string to process then
 *        Return pointer to error string.
 *        Else
 *        Initialize pointer to input string.
 *        Initialize pointer to result string.
 *        First arg is line number by default.
 *        Second arg is col number by default.
 *        No arguments processed yet.
 *        While there is another character to process
 *            If character is a not a % character then
 *            Simply copy to output.
 *            Else
 *            Process the control sequence.
 *            End if
 *        End while
 *        Return pointer to static output string.
 *        End if
 *    End tgoto
 *
 */

char *tgoto(cm,destcol,destline)
char *cm;
int destcol;
int destline;
{
    if (cm == NULL) {
    return("OOPS");
    } else {
    in = cm;
    out = output;
    args[0] = destline;
    args[1] = destcol;
    pcount = 0;
    while (*in != 0) {
        if (*in != '%') {
        *out++ = *in++;
        } else {
        process();
        }
    }
        *out++ = 0;
    return(output);
    }
}

/*
 *  INTERNAL FUNCTION
 *
 *    process   process the conversion/command sequence
 *
 *  SYNOPSIS
 *
 *    static process()
 *
 *  DESCRIPTION
 *
 *    Processes the sequence beginning with the % character.
 *    Directly manipulates the input string pointer, the
 *    output string pointer, and the arguments.  Leaves
 *    the input string pointer pointing to the next character
 *    to be processed, and the output string pointer pointing
 *    to the next output location.  If conversion of
 *    one of the numeric arguments occurs, then the pcount
 *    is incremented.
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin process
 *        Skip over the % character.
 *        Switch on next character after %
 *        Case 'd':
 *        Process %d type conversion (variable width).
 *        Reinitialize output pointer.
 *        Break;
 *        Case '2':
 *        Process %d type conversion (width 2).
 *        Reinitialize output pointer.
 *        Break;
 *        Case '3':
 *        Process %d type conversion (width 3).
 *        Reinitialize output pointer.
 *        Break;
 *        Case '.'
 *        Process %c type conversion.
 *        Break;
 *        Case '+':
 *        Process %c type conversion with offset.
 *        Break;
 *        Case '>':
 *        Process argument modification.
 *        Break;
 *        Case 'r':
 *        Process argument reversal.
 *        Break;
 *        Case 'i':
 *        Increment argument values.
 *        Break;
 *        Case '%':
 *        Copy to output, incrementing pointers.
 *        Break;
 *        End switch
 *    End process
 *
 */

static void process()
{
    int temp;

    in++;
    switch(*in++) {
    case 'd':
    sprintf(out,"%d",args[pcount++]);
    out = &output[strlen(output)];
    break;
    case '2':
    sprintf(out,"%02d",args[pcount++]);
    out = &output[strlen(output)];
    break;
    case '3':
    sprintf(out,"%03d",args[pcount++]);
    out = &output[strlen(output)];
    break;
    case '.':
    *out++ = (char) args[pcount++];
    break;
    case '+':
    *out++ = (char) args[pcount++] + *in++;
    break;
    case '>':
    if (args[pcount] > (int) *in++) {
        args[pcount] += *in++;
    } else {
        in++;
    }
    break;
    case 'r':
    temp = args[pcount];
    args[pcount] = args[pcount+1];
    args[pcount+1] = temp;
    break;
    case 'i':
    args[pcount]++;
    args[pcount+1]++;
    break;
    case '%':
    *out++ = '%';
    break;
    }
}


/*
 *  LIBRARY FUNCTION
 *
 *    tputs     output string with appropriate padding
 *
 *  KEY WORDS
 *
 *    termcap
 *
 *  SYNOPSIS
 *
 *    tputs(cp,affcnt,outc)
 *    char *cp;
 *    int affcnt;
 *    int (*outc)();
 *
 *  DESCRIPTION
 *
 *    Outputs string pointed to by cp, using function outc, and
 *    following it with the appropriate number of padding characters.
 *    Affcnt contains the number of lines affected, which is used
 *    as a multiplier for the specified per line pad time.  If
 *    per line pad count is not applicable, affcnt should be 1,
 *    NOT zero.
 *
 *    The format of the string pointed to by cp is:
 *
 *        [pad time][*]<string to send>
 *
 *        where:    pad time => time to delay in milliseconds
 *            * => specifies that time is per line
 *
 *    The pad character is assumed to reside in the external
 *    variable "PC".  Also, the external variable "ospeed"
 *    should contain the output speed of the terminal as
 *    encoded in /usr/include/sgtty.h  (B0-B9600).
 *
 *  BUGS
 *
 *    Digit conversion is based on native character set
 *    being ASCII.
 *
 */

/*
 *    Miscellaneous stuff
 */


# ifndef MSDOS
extern char PC;            /* Pad character to use */
extern char ospeed;        /* Encoding of output speed */

static int times[] = {
    0,                /* Tenths of ms per char 0 baud */
    2000,            /* Tenths of ms per char 50 baud */
    1333,            /* Tenths of ms per char 75 baud */
    909,            /* Tenths of ms per char 110 baud */
    743,            /* Tenths of ms per char 134 baud */
    666,            /* Tenths of ms per char 150 baud */
    500,            /* Tenths of ms per char 200 baud */
    333,            /* Tenths of ms per char 300 baud */
    166,            /* Tenths of ms per char 600 baud */
    83,                /* Tenths of ms per char 1200 baud */
    55,                /* Tenths of ms per char 1800 baud */
    41,                /* Tenths of ms per char 2400 baud */
    20,                /* Tenths of ms per char 4800 baud */
    10                /* Tenths of ms per char 9600 baud */
};
# endif

/*
 *  PSEUDO CODE
 *
 *    Begin tgoto
 *        If string pointer is invalid then
 *        Return without doing anything.
 *        Else
 *        For each pad digit (if any)
 *            Do decimal left shift.
 *            Accumulate the lower digit.
 *        End for
 *        Adjust scale to tenths of milliseconds
 *        If there is a fractional field
 *            Skip the decimal point.
 *            If there is a valid tenths digit
 *            Accumulate the tenths.
 *            End if
 *            Discard remaining digits.
 *        End if
 *        If per line is specified then
 *            Adjust the pad time.
 *            Discard the per line flag char.
 *        End if
 *        While there are any characters left
 *            Send them out via output function.
 *        End while
 *        Transmit any padding required.
 *        End if
 *    End tgoto
 *
 */

void tputs(cp,affcnt,outc)
char *cp;
int affcnt;
int (*outc)(int);
{
    int ptime;            /* Pad time in tenths of milliseconds */

    if (cp == NULL || *cp == 0) {
    return;
    } else {
    for (ptime = 0; isdigit(*cp); cp++) {
        ptime *= 10;
        ptime += (*cp - '0');
    }
    ptime *= 10;
    if (*cp == '.') {
        cp++;
        if (isdigit(*cp)) {
        ptime += (*cp++ - '0');
        }
        while (isdigit(*cp)) {cp++;}
    }
    if (*cp == '*') {
        ptime *= affcnt;
        cp++;
    }
    while (*cp != 0) {
        (*outc)(*cp++);
    }
# ifndef MSDOS
    do_padding(ptime,outc);
# endif
    }
}

# ifndef MSDOS
/*
 *  FUNCTION
 *
 *    do_padding    transmit any pad characters required
 *
 *  SYNOPSIS
 *
 *    static do_padding(ptime,outc)
 *    int ptime;
 *    int (*outc)();
 *
 *  DESCRIPTION
 *
 *    Does any padding required as specified by ptime (in tenths
 *    of milliseconds), the output speed given in the external
 *    variable ospeed, and the pad character given in the
 *    external variable PC.
 *
 */

/*
 *  PSEUDO CODE
 *
 *    Begin do_padding
 *        If there is a non-zero pad time then
 *        If the external speed is in range then
 *            Look up the delay per pad character.
 *            Round pad time up by half a character.
 *            Compute number of characters to send.
 *            For each pad character to send
 *            Transmit the pad character.
 *            End for
 *        End if
 *        End if
 *    End do_padding
 *
 */

static do_padding(ptime,outc)
int ptime;
int (*outc)();
{
    register int nchars;
    register int tpc;

    if (ptime != 0) {
    if (ospeed >= 0 && ospeed <= (sizeof(times)/ sizeof(int))) {
        tpc = times[ospeed];
        ptime += (tpc / 2);
        nchars = ptime / tpc;
        for ( ; nchars > 0; --nchars) {
        (*outc)(PC);
        }
    }
    }
}
# endif