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 Free Software Foundation, Inc.
6 This file is part of GNU Emacs.
8 GNU Emacs is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU Emacs is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU Emacs; see the file COPYING. If not, write to
20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
42 #ifndef DBL_MAX_10_EXP
43 #define DBL_MAX_10_EXP 308 /* IEEE double */
46 /* Since we use the macro CHAR_HEAD_P, we have to include this, but
47 don't have to include others because CHAR_HEAD_P does not contains
51 static int doprnt1 ();
53 /* Generate output from a format-spec FORMAT,
54 terminated at position FORMAT_END.
55 Output goes in BUFFER, which has room for BUFSIZE chars.
56 If the output does not fit, truncate it to fit.
57 Returns the number of characters stored into BUFFER.
58 ARGS points to the vector of arguments, and NARGS says how many.
59 A double counts as two arguments.
60 String arguments are passed as C strings.
61 Integers are passed as C integers. */
64 doprnt (buffer
, bufsize
, format
, format_end
, nargs
, args
)
72 return doprnt1 (0, buffer
, bufsize
, format
, format_end
, nargs
, args
);
75 /* Like doprnt except that strings in ARGS are passed
79 doprnt_lisp (buffer
, bufsize
, format
, format_end
, nargs
, args
)
87 return doprnt1 (1, buffer
, bufsize
, format
, format_end
, nargs
, args
);
91 doprnt1 (lispstrings
, buffer
, bufsize
, format
, format_end
, nargs
, args
)
100 int cnt
= 0; /* Number of arg to gobble next */
101 register char *fmt
= format
; /* Pointer into format string */
102 register char *bufptr
= buffer
; /* Pointer into output buffer.. */
104 /* Use this for sprintf unless we need something really big. */
105 char tembuf
[DBL_MAX_10_EXP
+ 100];
107 /* Size of sprintf_buffer. */
108 int size_allocated
= sizeof (tembuf
);
110 /* Buffer to use for sprintf. Either tembuf or same as BIG_BUFFER. */
111 char *sprintf_buffer
= tembuf
;
113 /* Buffer we have got with malloc. */
114 char *big_buffer
= 0;
117 unsigned char *string
;
118 char fixed_buffer
[20]; /* Default buffer for small formatting. */
121 unsigned char charbuf
[5]; /* Used for %c. */
124 format_end
= format
+ strlen (format
);
126 if ((format_end
- format
+ 1) < sizeof (fixed_buffer
))
127 fmtcpy
= fixed_buffer
;
129 fmtcpy
= (char *) alloca (format_end
- format
+ 1);
133 /* Loop until end of format string or buffer full. */
134 while (fmt
!= format_end
&& bufsize
> 0)
136 if (*fmt
== '%') /* Check for a '%' character */
139 int width
; /* Columns occupied by STRING. */
142 /* Copy this one %-spec into fmtcpy. */
143 string
= (unsigned char *)fmtcpy
;
148 if ('0' <= *fmt
&& *fmt
<= '9')
150 /* Get an idea of how much space we might need.
151 This might be a field width or a precision; e.g.
152 %1.1000f and %1000.1f both might need 1000+ bytes.
153 Parse the width or precision, checking for overflow. */
155 while ('0' <= fmt
[1] && fmt
[1] <= '9')
158 || (n
= n
* 10 + (fmt
[1] - '0')) < 0)
159 error ("Format width or precision too large");
166 else if (*fmt
== '-' || *fmt
== ' ' || *fmt
== '.')
174 /* Make the size bound large enough to handle floating point formats
175 with large numbers. */
176 size_bound
+= DBL_MAX_10_EXP
+ 50;
179 error ("Format width or precision too large");
181 /* Make sure we have that much. */
182 if (size_bound
> size_allocated
)
185 big_buffer
= (char *) xrealloc (big_buffer
, size_bound
);
187 big_buffer
= (char *) xmalloc (size_bound
);
188 sprintf_buffer
= big_buffer
;
189 size_allocated
= size_bound
;
195 error ("Invalid format operation %%%c", fmt
[-1]);
202 error ("Not enough arguments for format string");
203 if (sizeof (int) == sizeof (EMACS_INT
))
205 else if (sizeof (long) == sizeof (EMACS_INT
))
206 /* Insert an `l' the right place. */
207 string
[1] = string
[0],
208 string
[0] = string
[-1],
213 sprintf (sprintf_buffer
, fmtcpy
, args
[cnt
++]);
214 /* Now copy into final output, truncating as nec. */
215 string
= (unsigned char *)sprintf_buffer
;
222 union { double d
; char *half
[2]; } u
;
223 if (cnt
+ 1 == nargs
)
224 error ("not enough arguments for format string");
225 u
.half
[0] = args
[cnt
++];
226 u
.half
[1] = args
[cnt
++];
227 sprintf (sprintf_buffer
, fmtcpy
, u
.d
);
228 /* Now copy into final output, truncating as nec. */
229 string
= (unsigned char *)sprintf_buffer
;
237 error ("not enough arguments for format string");
238 if (fmtcpy
[1] != 's')
239 minlen
= atoi (&fmtcpy
[1]);
242 string
= ((struct Lisp_String
*)args
[cnt
])->data
;
243 tem
= ((struct Lisp_String
*)args
[cnt
])->size
;
248 string
= (unsigned char *)args
[cnt
++];
249 tem
= strlen (string
);
251 width
= strwidth (string
, tem
);
254 /* Copy string into final output, truncating if no room. */
256 /* Coming here means STRING contains ASCII only. */
257 width
= tem
= strlen (string
);
259 /* We have already calculated:
260 TEM -- length of STRING,
261 WIDTH -- columns occupied by STRING when displayed, and
262 MINLEN -- minimum columns of the output. */
265 while (minlen
> width
&& bufsize
> 0)
275 /* Truncate the string at character boundary. */
277 while (!CHAR_HEAD_P (string
[tem
- 1])) tem
--;
278 bcopy (string
, bufptr
, tem
);
279 /* We must calculate WIDTH again. */
280 width
= strwidth (bufptr
, tem
);
283 bcopy (string
, bufptr
, tem
);
288 while (minlen
< - width
&& bufsize
> 0)
300 error ("not enough arguments for format string");
301 tem
= CHAR_STRING ((int) (EMACS_INT
) args
[cnt
], charbuf
);
305 width
= strwidth (string
, tem
);
306 if (fmtcpy
[1] != 'c')
307 minlen
= atoi (&fmtcpy
[1]);
311 fmt
--; /* Drop thru and this % will be treated as normal */
316 /* Just some character; Copy it if the whole multi-byte form
317 fit in the buffer. */
318 char *save_bufptr
= bufptr
;
320 do { *bufptr
++ = *fmt
++; }
321 while (--bufsize
> 0 && !CHAR_HEAD_P (*fmt
));
322 if (!CHAR_HEAD_P (*fmt
))
324 bufptr
= save_bufptr
;
330 /* If we had to malloc something, free it. */
334 *bufptr
= 0; /* Make sure our string end with a '\0' */
335 return bufptr
- buffer
;