doprnt.c 5.86 KB
Newer Older
Joseph Arceneaux's avatar
Joseph Arceneaux committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
/* Output like sprintf to a buffer of specified size.
   Also takes args differently: pass one pointer to an array of strings
   in addition to the format string which is separate.
   Copyright (C) 1985 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


Richard M. Stallman's avatar
Richard M. Stallman committed
23
#include <config.h>
Joseph Arceneaux's avatar
Joseph Arceneaux committed
24 25 26
#include <stdio.h>
#include <ctype.h>

27 28
extern long *xmalloc (), *xrealloc ();

29 30 31 32 33 34 35 36
/* Generate output from a format-spec FORMAT,
   terminated at position FORMAT_END.
   Output goes in BUFFER, which has room for BUFSIZE chars.
   If the output does not fit, truncate it to fit.
   Returns the number of characters stored into BUFFER.
   ARGS points to the vector of arguments, and NARGS says how many.
   A double counts as two arguments.  */

Joseph Arceneaux's avatar
Joseph Arceneaux committed
37 38 39 40 41 42 43 44 45 46 47
doprnt (buffer, bufsize, format, format_end, nargs, args)
     char *buffer;
     register int bufsize;
     char *format;
     char *format_end;
     int nargs;
     char **args;
{
  int cnt = 0;			/* Number of arg to gobble next */
  register char *fmt = format;	/* Pointer into format string */
  register char *bufptr = buffer; /* Pointer into output buffer.. */
48

49 50
  /* Use this for sprintf unless we need something really big.  */
  char tembuf[100];
51

52 53
  /* Size of sprintf_buffer.  */
  int size_allocated = 100;
54

55 56
  /* Buffer to use for sprintf.  Either tembuf or same as BIG_BUFFER.  */
  char *sprintf_buffer = tembuf;
57

58 59
  /* Buffer we have got with malloc.  */
  char *big_buffer = 0;
60

Joseph Arceneaux's avatar
Joseph Arceneaux committed
61 62
  register int tem;
  char *string;
63 64
  char fixed_buffer[20];	/* Default buffer for small formatting. */
  char *fmtcpy;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
65 66
  int minlen;
  int size;			/* Field width factor; e.g., %90d */
67
  char charbuf[2];		/* Used for %c.  */
Joseph Arceneaux's avatar
Joseph Arceneaux committed
68 69 70 71

  if (format_end == 0)
    format_end = format + strlen (format);

72 73 74
  if ((format_end - format + 1) < sizeof (fixed_buffer))
    fmtcpy = fixed_buffer;
  else
75
    fmtcpy = (char *) alloca (format_end - format + 1);
76

Joseph Arceneaux's avatar
Joseph Arceneaux committed
77
  bufsize--;
78 79 80

  /* Loop until end of format string or buffer full. */
  while (fmt != format_end && bufsize > 0)
Joseph Arceneaux's avatar
Joseph Arceneaux committed
81 82 83
    {
      if (*fmt == '%')	/* Check for a '%' character */
	{
84 85
	  int size_bound;

Joseph Arceneaux's avatar
Joseph Arceneaux committed
86
	  fmt++;
Jim Blandy's avatar
Jim Blandy committed
87
	  /* Copy this one %-spec into fmtcpy.  */
Joseph Arceneaux's avatar
Joseph Arceneaux committed
88 89
	  string = fmtcpy;
	  *string++ = '%';
90
	  while (1)
Joseph Arceneaux's avatar
Joseph Arceneaux committed
91 92
	    {
	      *string++ = *fmt;
93 94
	      if (! (*fmt >= '0' && *fmt <= '9')
		  && *fmt != '-' && *fmt != ' '&& *fmt != '.')
Joseph Arceneaux's avatar
Joseph Arceneaux committed
95 96 97 98
		break;
	      fmt++;
	    }
	  *string = 0;
99
	  /* Get an idea of how much space we might need.  */
100
	  size_bound = atoi (&fmtcpy[1]);
101 102 103 104

	  /* Avoid pitfall of negative "size" parameter ("%-200d"). */
	  if (size_bound < 0)
	    size_bound = -size_bound;
105
	  size_bound += 50;
106

107 108 109 110 111 112 113 114 115 116
	  /* Make sure we have that much.  */
	  if (size_bound > size_allocated)
	    {
	      if (big_buffer)
		big_buffer = (char *) xrealloc (big_buffer, size_bound);
	      else
		big_buffer = (char *) xmalloc (size_bound);
	      sprintf_buffer = big_buffer;
	      size_allocated = size_bound;
	    }
Joseph Arceneaux's avatar
Joseph Arceneaux committed
117 118 119 120 121 122 123 124 125 126 127
	  minlen = 0;
	  switch (*fmt++)
	    {
	    default:
	      error ("Invalid format operation %%%c", fmt[-1]);

/*	    case 'b': */
	    case 'd':
	    case 'o':
	    case 'x':
	      if (cnt == nargs)
128
		error ("not enough arguments for format string");
129 130 131 132 133 134 135 136 137 138
	      if (sizeof (int) == sizeof (EMACS_INT))
		;
	      else if (sizeof (long) == sizeof (EMACS_INT))
		/* Insert an `l' the right place.  */
		string[1] = string[0],
		string[0] = string[-1],
		string[-1] = 'l',
		string++;
	      else
		abort ();
139 140 141
	      sprintf (sprintf_buffer, fmtcpy, args[cnt++]);
	      /* Now copy into final output, truncating as nec.  */
	      string = sprintf_buffer;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
142 143
	      goto doit;

144 145 146 147 148 149
	    case 'f':
	    case 'e':
	    case 'g':
	      {
		union { double d; char *half[2]; } u;
		if (cnt + 1 == nargs)
150
		  error ("not enough arguments for format string");
151 152 153 154 155 156 157 158
		u.half[0] = args[cnt++];
		u.half[1] = args[cnt++];
		sprintf (sprintf_buffer, fmtcpy, u.d);
		/* Now copy into final output, truncating as nec.  */
		string = sprintf_buffer;
		goto doit;
	      }

Joseph Arceneaux's avatar
Joseph Arceneaux committed
159 160 161 162
	    case 'S':
	      string[-1] = 's';
	    case 's':
	      if (cnt == nargs)
163
		error ("not enough arguments for format string");
Joseph Arceneaux's avatar
Joseph Arceneaux committed
164 165 166 167 168 169
	      string = args[cnt++];
	      if (fmtcpy[1] != 's')
		minlen = atoi (&fmtcpy[1]);
	      /* Copy string into final output, truncating if no room.  */
	    doit:
	      tem = strlen (string);
170
	    doit1:
Joseph Arceneaux's avatar
Joseph Arceneaux committed
171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
	      if (minlen > 0)
		{
		  while (minlen > tem && bufsize > 0)
		    {
		      *bufptr++ = ' ';
		      bufsize--;
		      minlen--;
		    }
		  minlen = 0;
		}
	      if (tem > bufsize)
		tem = bufsize;
	      strncpy (bufptr, string, tem);
	      bufptr += tem;
	      bufsize -= tem;
	      if (minlen < 0)
		{
		  while (minlen < - tem && bufsize > 0)
		    {
		      *bufptr++ = ' ';
		      bufsize--;
		      minlen++;
		    }
		  minlen = 0;
		}
	      continue;

	    case 'c':
	      if (cnt == nargs)
200
		error ("not enough arguments for format string");
201
	      *charbuf = (EMACS_INT) args[cnt++];
202 203 204 205 206
	      string = charbuf;
	      tem = 1;
	      if (fmtcpy[1] != 'c')
		minlen = atoi (&fmtcpy[1]);
	      goto doit1;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
207 208 209 210 211 212 213 214 215

	    case '%':
	      fmt--;    /* Drop thru and this % will be treated as normal */
	    }
	}
      *bufptr++ = *fmt++;	/* Just some characters; Copy 'em */
      bufsize--;
    };

216 217
  /* If we had to malloc something, free it.  */
  if (big_buffer)
218
    xfree (big_buffer);
219

Joseph Arceneaux's avatar
Joseph Arceneaux committed
220 221 222
  *bufptr = 0;		/* Make sure our string end with a '\0' */
  return bufptr - buffer;
}