| 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. |
| 5 | |
| 6 | This file is part of GNU Emacs. |
| 7 | |
| 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) |
| 11 | any later version. |
| 12 | |
| 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. |
| 17 | |
| 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. */ |
| 22 | |
| 23 | |
| 24 | #include <config.h> |
| 25 | #include <stdio.h> |
| 26 | #include <ctype.h> |
| 27 | |
| 28 | #ifdef STDC_HEADERS |
| 29 | #include <float.h> |
| 30 | #endif |
| 31 | |
| 32 | #include "lisp.h" |
| 33 | |
| 34 | #ifndef DBL_MAX_10_EXP |
| 35 | #define DBL_MAX_10_EXP 308 /* IEEE double */ |
| 36 | #endif |
| 37 | |
| 38 | /* Since we use the macro CHAR_HEAD_P, we have to include this, but |
| 39 | don't have to include others because CHAR_HEAD_P does not contains |
| 40 | another macro. */ |
| 41 | #include "charset.h" |
| 42 | |
| 43 | extern long *xmalloc (), *xrealloc (); |
| 44 | |
| 45 | static int doprnt1 (); |
| 46 | |
| 47 | /* Generate output from a format-spec FORMAT, |
| 48 | terminated at position FORMAT_END. |
| 49 | Output goes in BUFFER, which has room for BUFSIZE chars. |
| 50 | If the output does not fit, truncate it to fit. |
| 51 | Returns the number of characters stored into BUFFER. |
| 52 | ARGS points to the vector of arguments, and NARGS says how many. |
| 53 | A double counts as two arguments. |
| 54 | String arguments are passed as C strings. |
| 55 | Integers are passed as C integers. */ |
| 56 | |
| 57 | int |
| 58 | doprnt (buffer, bufsize, format, format_end, nargs, args) |
| 59 | char *buffer; |
| 60 | register int bufsize; |
| 61 | char *format; |
| 62 | char *format_end; |
| 63 | int nargs; |
| 64 | char **args; |
| 65 | { |
| 66 | return doprnt1 (0, buffer, bufsize, format, format_end, nargs, args); |
| 67 | } |
| 68 | |
| 69 | /* Like doprnt except that strings in ARGS are passed |
| 70 | as Lisp_Object. */ |
| 71 | |
| 72 | int |
| 73 | doprnt_lisp (buffer, bufsize, format, format_end, nargs, args) |
| 74 | char *buffer; |
| 75 | register int bufsize; |
| 76 | char *format; |
| 77 | char *format_end; |
| 78 | int nargs; |
| 79 | char **args; |
| 80 | { |
| 81 | return doprnt1 (1, buffer, bufsize, format, format_end, nargs, args); |
| 82 | } |
| 83 | |
| 84 | static int |
| 85 | doprnt1 (lispstrings, buffer, bufsize, format, format_end, nargs, args) |
| 86 | int lispstrings; |
| 87 | char *buffer; |
| 88 | register int bufsize; |
| 89 | char *format; |
| 90 | char *format_end; |
| 91 | int nargs; |
| 92 | char **args; |
| 93 | { |
| 94 | int cnt = 0; /* Number of arg to gobble next */ |
| 95 | register char *fmt = format; /* Pointer into format string */ |
| 96 | register char *bufptr = buffer; /* Pointer into output buffer.. */ |
| 97 | |
| 98 | /* Use this for sprintf unless we need something really big. */ |
| 99 | char tembuf[DBL_MAX_10_EXP + 100]; |
| 100 | |
| 101 | /* Size of sprintf_buffer. */ |
| 102 | int size_allocated = sizeof (tembuf); |
| 103 | |
| 104 | /* Buffer to use for sprintf. Either tembuf or same as BIG_BUFFER. */ |
| 105 | char *sprintf_buffer = tembuf; |
| 106 | |
| 107 | /* Buffer we have got with malloc. */ |
| 108 | char *big_buffer = 0; |
| 109 | |
| 110 | register int tem; |
| 111 | char *string; |
| 112 | char fixed_buffer[20]; /* Default buffer for small formatting. */ |
| 113 | char *fmtcpy; |
| 114 | int minlen; |
| 115 | int size; /* Field width factor; e.g., %90d */ |
| 116 | unsigned char charbuf[5]; /* Used for %c. */ |
| 117 | |
| 118 | if (format_end == 0) |
| 119 | format_end = format + strlen (format); |
| 120 | |
| 121 | if ((format_end - format + 1) < sizeof (fixed_buffer)) |
| 122 | fmtcpy = fixed_buffer; |
| 123 | else |
| 124 | fmtcpy = (char *) alloca (format_end - format + 1); |
| 125 | |
| 126 | bufsize--; |
| 127 | |
| 128 | /* Loop until end of format string or buffer full. */ |
| 129 | while (fmt != format_end && bufsize > 0) |
| 130 | { |
| 131 | if (*fmt == '%') /* Check for a '%' character */ |
| 132 | { |
| 133 | int size_bound = 0; |
| 134 | int width; /* Columns occupied by STRING. */ |
| 135 | |
| 136 | fmt++; |
| 137 | /* Copy this one %-spec into fmtcpy. */ |
| 138 | string = fmtcpy; |
| 139 | *string++ = '%'; |
| 140 | while (1) |
| 141 | { |
| 142 | *string++ = *fmt; |
| 143 | if ('0' <= *fmt && *fmt <= '9') |
| 144 | { |
| 145 | /* Get an idea of how much space we might need. |
| 146 | This might be a field width or a precision; e.g. |
| 147 | %1.1000f and %1000.1f both might need 1000+ bytes. |
| 148 | Parse the width or precision, checking for overflow. */ |
| 149 | int n = *fmt - '0'; |
| 150 | while ('0' <= fmt[1] && fmt[1] <= '9') |
| 151 | { |
| 152 | if (n * 10 / 10 != n |
| 153 | || (n = n * 10 + (fmt[1] - '0')) < 0) |
| 154 | error ("Format width or precision too large"); |
| 155 | *string++ = *++fmt; |
| 156 | } |
| 157 | |
| 158 | if (size_bound < n) |
| 159 | size_bound = n; |
| 160 | } |
| 161 | else if (*fmt == '-' || *fmt == ' ' || *fmt == '.') |
| 162 | ; |
| 163 | else |
| 164 | break; |
| 165 | fmt++; |
| 166 | } |
| 167 | *string = 0; |
| 168 | |
| 169 | /* Make the size bound large enough to handle floating point formats |
| 170 | with large numbers. */ |
| 171 | size_bound += DBL_MAX_10_EXP + 50; |
| 172 | |
| 173 | if (size_bound < 0) |
| 174 | error ("Format width or precision too large"); |
| 175 | |
| 176 | /* Make sure we have that much. */ |
| 177 | if (size_bound > size_allocated) |
| 178 | { |
| 179 | if (big_buffer) |
| 180 | big_buffer = (char *) xrealloc (big_buffer, size_bound); |
| 181 | else |
| 182 | big_buffer = (char *) xmalloc (size_bound); |
| 183 | sprintf_buffer = big_buffer; |
| 184 | size_allocated = size_bound; |
| 185 | } |
| 186 | minlen = 0; |
| 187 | switch (*fmt++) |
| 188 | { |
| 189 | default: |
| 190 | error ("Invalid format operation %%%c", fmt[-1]); |
| 191 | |
| 192 | /* case 'b': */ |
| 193 | case 'd': |
| 194 | case 'o': |
| 195 | case 'x': |
| 196 | if (cnt == nargs) |
| 197 | error ("Not enough arguments for format string"); |
| 198 | if (sizeof (int) == sizeof (EMACS_INT)) |
| 199 | ; |
| 200 | else if (sizeof (long) == sizeof (EMACS_INT)) |
| 201 | /* Insert an `l' the right place. */ |
| 202 | string[1] = string[0], |
| 203 | string[0] = string[-1], |
| 204 | string[-1] = 'l', |
| 205 | string++; |
| 206 | else |
| 207 | abort (); |
| 208 | sprintf (sprintf_buffer, fmtcpy, args[cnt++]); |
| 209 | /* Now copy into final output, truncating as nec. */ |
| 210 | string = sprintf_buffer; |
| 211 | goto doit; |
| 212 | |
| 213 | case 'f': |
| 214 | case 'e': |
| 215 | case 'g': |
| 216 | { |
| 217 | union { double d; char *half[2]; } u; |
| 218 | if (cnt + 1 == nargs) |
| 219 | error ("not enough arguments for format string"); |
| 220 | u.half[0] = args[cnt++]; |
| 221 | u.half[1] = args[cnt++]; |
| 222 | sprintf (sprintf_buffer, fmtcpy, u.d); |
| 223 | /* Now copy into final output, truncating as nec. */ |
| 224 | string = sprintf_buffer; |
| 225 | goto doit; |
| 226 | } |
| 227 | |
| 228 | case 'S': |
| 229 | string[-1] = 's'; |
| 230 | case 's': |
| 231 | if (cnt == nargs) |
| 232 | error ("not enough arguments for format string"); |
| 233 | if (fmtcpy[1] != 's') |
| 234 | minlen = atoi (&fmtcpy[1]); |
| 235 | if (lispstrings) |
| 236 | { |
| 237 | string = (char *) ((struct Lisp_String *)args[cnt])->data; |
| 238 | tem = ((struct Lisp_String *)args[cnt])->size; |
| 239 | cnt++; |
| 240 | } |
| 241 | else |
| 242 | { |
| 243 | string = args[cnt++]; |
| 244 | tem = strlen (string); |
| 245 | } |
| 246 | width = strwidth (string, tem); |
| 247 | goto doit1; |
| 248 | |
| 249 | /* Copy string into final output, truncating if no room. */ |
| 250 | doit: |
| 251 | /* Coming here means STRING contains ASCII only. */ |
| 252 | width = tem = strlen (string); |
| 253 | doit1: |
| 254 | /* We have already calculated: |
| 255 | TEM -- length of STRING, |
| 256 | WIDTH -- columns occupied by STRING when displayed, and |
| 257 | MINLEN -- minimum columns of the output. */ |
| 258 | if (minlen > 0) |
| 259 | { |
| 260 | while (minlen > width && bufsize > 0) |
| 261 | { |
| 262 | *bufptr++ = ' '; |
| 263 | bufsize--; |
| 264 | minlen--; |
| 265 | } |
| 266 | minlen = 0; |
| 267 | } |
| 268 | if (tem > bufsize) |
| 269 | { |
| 270 | /* Truncate the string at character boundary. */ |
| 271 | tem = bufsize; |
| 272 | while (!CHAR_HEAD_P (string[tem - 1])) tem--; |
| 273 | bcopy (string, bufptr, tem); |
| 274 | /* We must calculate WIDTH again. */ |
| 275 | width = strwidth (bufptr, tem); |
| 276 | } |
| 277 | else |
| 278 | bcopy (string, bufptr, tem); |
| 279 | bufptr += tem; |
| 280 | bufsize -= tem; |
| 281 | if (minlen < 0) |
| 282 | { |
| 283 | while (minlen < - width && bufsize > 0) |
| 284 | { |
| 285 | *bufptr++ = ' '; |
| 286 | bufsize--; |
| 287 | minlen++; |
| 288 | } |
| 289 | minlen = 0; |
| 290 | } |
| 291 | continue; |
| 292 | |
| 293 | case 'c': |
| 294 | if (cnt == nargs) |
| 295 | error ("not enough arguments for format string"); |
| 296 | tem = CHAR_STRING ((EMACS_INT) args[cnt], charbuf, string); |
| 297 | cnt++; |
| 298 | string[tem] = 0; |
| 299 | width = strwidth (string, tem); |
| 300 | if (fmtcpy[1] != 'c') |
| 301 | minlen = atoi (&fmtcpy[1]); |
| 302 | goto doit1; |
| 303 | |
| 304 | case '%': |
| 305 | fmt--; /* Drop thru and this % will be treated as normal */ |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | { |
| 310 | /* Just some character; Copy it if the whole multi-byte form |
| 311 | fit in the buffer. */ |
| 312 | char *save_bufptr = bufptr; |
| 313 | |
| 314 | do { *bufptr++ = *fmt++; } |
| 315 | while (--bufsize > 0 && !CHAR_HEAD_P (*fmt)); |
| 316 | if (!CHAR_HEAD_P (*fmt)) |
| 317 | { |
| 318 | bufptr = save_bufptr; |
| 319 | break; |
| 320 | } |
| 321 | } |
| 322 | }; |
| 323 | |
| 324 | /* If we had to malloc something, free it. */ |
| 325 | if (big_buffer) |
| 326 | xfree (big_buffer); |
| 327 | |
| 328 | *bufptr = 0; /* Make sure our string end with a '\0' */ |
| 329 | return bufptr - buffer; |
| 330 | } |