doprnt.c 5.96 KB
Newer Older
Joseph Arceneaux's avatar
Joseph Arceneaux committed
1 2 3 4 5 6 7 8 9
/* 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
Karl Heuer's avatar
Karl Heuer committed
10
the Free Software Foundation; either version 2, or (at your option)
Joseph Arceneaux's avatar
Joseph Arceneaux committed
11 12 13 14 15 16 17 18 19 20 21 22
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
	  if (size_bound > (unsigned) (1 << (INTBITS - 1)))
	    error ("Format padding to large");
109

110 111 112 113 114 115 116 117 118 119
	  /* 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
120 121 122 123 124 125 126 127 128 129 130
	  minlen = 0;
	  switch (*fmt++)
	    {
	    default:
	      error ("Invalid format operation %%%c", fmt[-1]);

/*	    case 'b': */
	    case 'd':
	    case 'o':
	    case 'x':
	      if (cnt == nargs)
131
		error ("Not enough arguments for format string");
132 133 134 135 136 137 138 139 140 141
	      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 ();
142 143 144
	      sprintf (sprintf_buffer, fmtcpy, args[cnt++]);
	      /* Now copy into final output, truncating as nec.  */
	      string = sprintf_buffer;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
145 146
	      goto doit;

147 148 149 150 151 152
	    case 'f':
	    case 'e':
	    case 'g':
	      {
		union { double d; char *half[2]; } u;
		if (cnt + 1 == nargs)
153
		  error ("not enough arguments for format string");
154 155 156 157 158 159 160 161
		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
162 163 164 165
	    case 'S':
	      string[-1] = 's';
	    case 's':
	      if (cnt == nargs)
166
		error ("not enough arguments for format string");
Joseph Arceneaux's avatar
Joseph Arceneaux committed
167 168 169 170 171 172
	      string = args[cnt++];
	      if (fmtcpy[1] != 's')
		minlen = atoi (&fmtcpy[1]);
	      /* Copy string into final output, truncating if no room.  */
	    doit:
	      tem = strlen (string);
173
	    doit1:
Joseph Arceneaux's avatar
Joseph Arceneaux committed
174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202
	      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)
203
		error ("not enough arguments for format string");
204
	      *charbuf = (EMACS_INT) args[cnt++];
205 206 207 208 209
	      string = charbuf;
	      tem = 1;
	      if (fmtcpy[1] != 'c')
		minlen = atoi (&fmtcpy[1]);
	      goto doit1;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
210 211 212 213 214 215 216 217 218

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

219 220
  /* If we had to malloc something, free it.  */
  if (big_buffer)
221
    xfree (big_buffer);
222

Joseph Arceneaux's avatar
Joseph Arceneaux committed
223 224 225
  *bufptr = 0;		/* Make sure our string end with a '\0' */
  return bufptr - buffer;
}