1: /* Output like sprintf to a buffer of specified size.
   2:    Also takes args differently: pass one pointer to an array of strings
   3:    in addition to the format string which is separate.
   4:    Copyright (C) 1985 Richard M. Stallman.
   5: 
   6: This file is part of GNU Emacs.
   7: 
   8: GNU Emacs is distributed in the hope that it will be useful,
   9: but WITHOUT ANY WARRANTY.  No author or distributor
  10: accepts responsibility to anyone for the consequences of using it
  11: or for whether it serves any particular purpose or works at all,
  12: unless he says so in writing.  Refer to the GNU Emacs General Public
  13: License for full details.
  14: 
  15: Everyone is granted permission to copy, modify and redistribute
  16: GNU Emacs, but only under the conditions described in the
  17: GNU Emacs General Public License.   A copy of this license is
  18: supposed to have been given to you along with GNU Emacs so you
  19: can know your rights and responsibilities.  It should be in a
  20: file named COPYING.  Among other things, the copyright notice
  21: and this notice must be preserved on all copies.  */
  22: 
  23: 
  24: #include <stdio.h>
  25: #include <ctype.h>
  26: 
  27: doprnt (buffer, bufsize, format, args)
  28:      char *buffer;
  29:      register int bufsize;
  30:      char *format;
  31:      char **args;
  32: {
  33:   int cnt = 0;          /* Number of arg to gobble next */
  34:   register char *fmt = format;  /* Pointer into format string */
  35:   register char *bufptr = buffer; /* Pointer into output buffer.. */
  36:   char tembuf[80];
  37:   register int tem;
  38:   char *string;
  39:   char fmtcpy[20];
  40:   int minlen;
  41: 
  42:   bufsize--;
  43:   while (*fmt && bufsize > 0)   /* Loop until end of format string or buffer full */
  44:     {
  45:       if (*fmt == '%')  /* Check for a '%' character */
  46:     {
  47:       fmt++;
  48:       /* Copy this one %-spec into fmtcopy.  */
  49:       string = fmtcpy;
  50:       *string++ = '%';
  51:       while (1)
  52:         {
  53:           *string++ = *fmt;
  54:           if (! (*fmt >= '0' && *fmt <= '9') && *fmt != '-' && *fmt != ' ')
  55:         break;
  56:           fmt++;
  57:         }
  58:       *string = 0;
  59:       minlen = 0;
  60:       switch (*fmt++)
  61:         {
  62:         default:
  63:           error ("Invalid format operation %%%c", fmt[-1]);
  64: 
  65:         case 'b':
  66:         case 'd':
  67:         case 'o':
  68:         case 'x':
  69:           sprintf (tembuf, fmtcpy, args[cnt++]);
  70:           /* Now copy tembuf into final output, truncating as nec.  */
  71:           string = tembuf;
  72:           goto doit;
  73: 
  74:         case 's':
  75:           string = args[cnt++];
  76:           if (fmtcpy[1] != 's')
  77:         minlen = atoi (&fmtcpy[1]);
  78:           /* Copy string into final output, truncating if no room.  */
  79:         doit:
  80:           tem = strlen (string);
  81:           minlen -= tem;
  82:           while (minlen > 0 && bufsize > 0)
  83:         {
  84:           *bufptr++ = ' ';
  85:           bufsize--;
  86:           minlen--;
  87:         }
  88:           if (tem > bufsize)
  89:         tem = bufsize;
  90:           strncpy (bufptr, string, tem);
  91:           bufptr += tem;
  92:           bufsize -= tem;
  93:           continue;
  94: 
  95:         case 'c':
  96:           *bufptr++ = (int) args[cnt++];
  97:           bufsize--;
  98:           continue;
  99: 
 100:         case '%':
 101:           fmt--;    /* Drop thru and this % will be treated as normal */
 102:         }
 103:     }
 104:       *bufptr++ = *fmt++;   /* Just some characters; Copy 'em */
 105:       bufsize--;
 106:     };
 107: 
 108:   *bufptr = 0;      /* Make sure our string end with a '\0' */
 109:   return bufptr - buffer;
 110: }

Defined functions

Last modified: 1985-11-23
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