doprnt.c 6.93 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
#include <stdio.h>
#include <ctype.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
26
#include "lisp.h"
Joseph Arceneaux's avatar
Joseph Arceneaux committed
27

28 29
extern long *xmalloc (), *xrealloc ();

Richard M. Stallman's avatar
Richard M. Stallman committed
30 31
static int doprnt1 ();

32 33 34 35 36 37
/* 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.
Richard M. Stallman's avatar
Richard M. Stallman committed
38 39 40
   A double counts as two arguments.
   String arguments are passed as C strings.
   Integers are passed as C integers.  */
41

Joseph Arceneaux's avatar
Joseph Arceneaux committed
42 43 44 45 46 47 48
doprnt (buffer, bufsize, format, format_end, nargs, args)
     char *buffer;
     register int bufsize;
     char *format;
     char *format_end;
     int nargs;
     char **args;
Richard M. Stallman's avatar
Richard M. Stallman committed
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
{
  return doprnt1 (0, buffer, bufsize, format, format_end, nargs, args);
}

/* Like doprnt except that strings in ARGS are passed
   as Lisp_Object.  */

doprnt_lisp (buffer, bufsize, format, format_end, nargs, args)
     char *buffer;
     register int bufsize;
     char *format;
     char *format_end;
     int nargs;
     char **args;
{
  return doprnt1 (1, buffer, bufsize, format, format_end, nargs, args);
}

static int
doprnt1 (lispstrings, buffer, bufsize, format, format_end, nargs, args)
     int lispstrings;
     char *buffer;
     register int bufsize;
     char *format;
     char *format_end;
     int nargs;
     char **args;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
76 77 78 79
{
  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.. */
80

81 82
  /* Use this for sprintf unless we need something really big.  */
  char tembuf[100];
83

84 85
  /* Size of sprintf_buffer.  */
  int size_allocated = 100;
86

87 88
  /* Buffer to use for sprintf.  Either tembuf or same as BIG_BUFFER.  */
  char *sprintf_buffer = tembuf;
89

90 91
  /* Buffer we have got with malloc.  */
  char *big_buffer = 0;
92

Joseph Arceneaux's avatar
Joseph Arceneaux committed
93 94
  register int tem;
  char *string;
95 96
  char fixed_buffer[20];	/* Default buffer for small formatting. */
  char *fmtcpy;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
97 98
  int minlen;
  int size;			/* Field width factor; e.g., %90d */
99
  char charbuf[2];		/* Used for %c.  */
Joseph Arceneaux's avatar
Joseph Arceneaux committed
100 101 102 103

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

104 105 106
  if ((format_end - format + 1) < sizeof (fixed_buffer))
    fmtcpy = fixed_buffer;
  else
107
    fmtcpy = (char *) alloca (format_end - format + 1);
108

Joseph Arceneaux's avatar
Joseph Arceneaux committed
109
  bufsize--;
110 111 112

  /* Loop until end of format string or buffer full. */
  while (fmt != format_end && bufsize > 0)
Joseph Arceneaux's avatar
Joseph Arceneaux committed
113 114 115
    {
      if (*fmt == '%')	/* Check for a '%' character */
	{
116 117
	  int size_bound;

Joseph Arceneaux's avatar
Joseph Arceneaux committed
118
	  fmt++;
Jim Blandy's avatar
Jim Blandy committed
119
	  /* Copy this one %-spec into fmtcpy.  */
Joseph Arceneaux's avatar
Joseph Arceneaux committed
120 121
	  string = fmtcpy;
	  *string++ = '%';
122
	  while (1)
Joseph Arceneaux's avatar
Joseph Arceneaux committed
123 124
	    {
	      *string++ = *fmt;
125 126
	      if (! (*fmt >= '0' && *fmt <= '9')
		  && *fmt != '-' && *fmt != ' '&& *fmt != '.')
Joseph Arceneaux's avatar
Joseph Arceneaux committed
127 128 129 130
		break;
	      fmt++;
	    }
	  *string = 0;
131
	  /* Get an idea of how much space we might need.  */
132
	  size_bound = atoi (&fmtcpy[1]);
133 134 135 136

	  /* Avoid pitfall of negative "size" parameter ("%-200d"). */
	  if (size_bound < 0)
	    size_bound = -size_bound;
137
	  size_bound += 50;
138

139
	  if (size_bound > (unsigned) (1 << (BITS_PER_INT - 1)))
140
	    error ("Format padding too large");
141

142 143 144 145 146 147 148 149 150 151
	  /* 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
152 153 154 155 156 157 158 159 160 161 162
	  minlen = 0;
	  switch (*fmt++)
	    {
	    default:
	      error ("Invalid format operation %%%c", fmt[-1]);

/*	    case 'b': */
	    case 'd':
	    case 'o':
	    case 'x':
	      if (cnt == nargs)
163
		error ("Not enough arguments for format string");
164 165 166 167 168 169 170 171 172 173
	      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 ();
174 175 176
	      sprintf (sprintf_buffer, fmtcpy, args[cnt++]);
	      /* Now copy into final output, truncating as nec.  */
	      string = sprintf_buffer;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
177 178
	      goto doit;

179 180 181 182 183 184
	    case 'f':
	    case 'e':
	    case 'g':
	      {
		union { double d; char *half[2]; } u;
		if (cnt + 1 == nargs)
185
		  error ("not enough arguments for format string");
186 187 188 189 190 191 192 193
		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
194 195 196 197
	    case 'S':
	      string[-1] = 's';
	    case 's':
	      if (cnt == nargs)
198
		error ("not enough arguments for format string");
Joseph Arceneaux's avatar
Joseph Arceneaux committed
199 200
	      if (fmtcpy[1] != 's')
		minlen = atoi (&fmtcpy[1]);
Richard M. Stallman's avatar
Richard M. Stallman committed
201 202
	      if (lispstrings)
		{
Richard M. Stallman's avatar
Richard M. Stallman committed
203
		  string = (char *) XSTRING (((Lisp_Object *) args)[cnt])->data;
Richard M. Stallman's avatar
Richard M. Stallman committed
204 205 206 207 208 209 210 211 212 213
		  tem = XSTRING (((Lisp_Object *) args)[cnt])->size;
		  cnt++;
		}
	      else
		{
		  string = args[cnt++];
		  tem = strlen (string);
		}
	      goto doit1;

Joseph Arceneaux's avatar
Joseph Arceneaux committed
214 215 216
	      /* Copy string into final output, truncating if no room.  */
	    doit:
	      tem = strlen (string);
217
	    doit1:
Joseph Arceneaux's avatar
Joseph Arceneaux committed
218 219 220 221 222 223 224 225 226 227 228 229
	      if (minlen > 0)
		{
		  while (minlen > tem && bufsize > 0)
		    {
		      *bufptr++ = ' ';
		      bufsize--;
		      minlen--;
		    }
		  minlen = 0;
		}
	      if (tem > bufsize)
		tem = bufsize;
Richard M. Stallman's avatar
Richard M. Stallman committed
230
	      bcopy (string, bufptr, tem);
Joseph Arceneaux's avatar
Joseph Arceneaux committed
231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
	      bufptr += tem;
	      bufsize -= tem;
	      if (minlen < 0)
		{
		  while (minlen < - tem && bufsize > 0)
		    {
		      *bufptr++ = ' ';
		      bufsize--;
		      minlen++;
		    }
		  minlen = 0;
		}
	      continue;

	    case 'c':
	      if (cnt == nargs)
247
		error ("not enough arguments for format string");
248
	      *charbuf = (EMACS_INT) args[cnt++];
249 250 251 252 253
	      string = charbuf;
	      tem = 1;
	      if (fmtcpy[1] != 'c')
		minlen = atoi (&fmtcpy[1]);
	      goto doit1;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
254 255 256 257 258 259 260 261 262

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

263 264
  /* If we had to malloc something, free it.  */
  if (big_buffer)
265
    xfree (big_buffer);
266

Joseph Arceneaux's avatar
Joseph Arceneaux committed
267 268 269
  *bufptr = 0;		/* Make sure our string end with a '\0' */
  return bufptr - buffer;
}