| 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 21 | |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <ctype.h> |
| 25 | |
| 26 | /* Generate output from a format-spec FORMAT, |
| 27 | terminated at position FORMAT_END. |
| 28 | Output goes in BUFFER, which has room for BUFSIZE chars. |
| 29 | If the output does not fit, truncate it to fit. |
| 30 | Returns the number of characters stored into BUFFER. |
| 31 | ARGS points to the vector of arguments, and NARGS says how many. |
| 32 | A double counts as two arguments. */ |
| 33 | |
| 34 | doprnt (buffer, bufsize, format, format_end, nargs, args) |
| 35 | char *buffer; |
| 36 | register int bufsize; |
| 37 | char *format; |
| 38 | char *format_end; |
| 39 | int nargs; |
| 40 | char **args; |
| 41 | { |
| 42 | int cnt = 0; /* Number of arg to gobble next */ |
| 43 | register char *fmt = format; /* Pointer into format string */ |
| 44 | register char *bufptr = buffer; /* Pointer into output buffer.. */ |
| 45 | /* Use this for sprintf unless we need something really big. */ |
| 46 | char tembuf[100]; |
| 47 | /* Size of sprintf_buffer. */ |
| 48 | int size_allocated = 100; |
| 49 | /* Buffer to use for sprintf. Either tembuf or same as BIG_BUFFER. */ |
| 50 | char *sprintf_buffer = tembuf; |
| 51 | /* Buffer we have got with malloc. */ |
| 52 | char *big_buffer = 0; |
| 53 | register int tem; |
| 54 | char *string; |
| 55 | char fmtcpy[20]; |
| 56 | int minlen; |
| 57 | int size; /* Field width factor; e.g., %90d */ |
| 58 | |
| 59 | if (format_end == 0) |
| 60 | format_end = format + strlen (format); |
| 61 | |
| 62 | bufsize--; |
| 63 | while (fmt != format_end && bufsize > 0) /* Loop until end of format |
| 64 | string or buffer full */ |
| 65 | { |
| 66 | if (*fmt == '%') /* Check for a '%' character */ |
| 67 | { |
| 68 | int size_bound; |
| 69 | |
| 70 | fmt++; |
| 71 | /* Copy this one %-spec into fmtcpy. */ |
| 72 | string = fmtcpy; |
| 73 | *string++ = '%'; |
| 74 | while (string < fmtcpy + sizeof fmtcpy - 1) |
| 75 | { |
| 76 | *string++ = *fmt; |
| 77 | if (! (*fmt >= '0' && *fmt <= '9') && *fmt != '-' && *fmt != ' ') |
| 78 | break; |
| 79 | fmt++; |
| 80 | } |
| 81 | *string = 0; |
| 82 | /* Get an idea of how much space we might need. */ |
| 83 | size_bound = atoi (&fmtcpy[1]) + 50; |
| 84 | /* Make sure we have that much. */ |
| 85 | if (size_bound > size_allocated) |
| 86 | { |
| 87 | if (big_buffer) |
| 88 | big_buffer = (char *) xrealloc (big_buffer, size_bound); |
| 89 | else |
| 90 | big_buffer = (char *) xmalloc (size_bound); |
| 91 | sprintf_buffer = big_buffer; |
| 92 | size_allocated = size_bound; |
| 93 | } |
| 94 | minlen = 0; |
| 95 | switch (*fmt++) |
| 96 | { |
| 97 | default: |
| 98 | error ("Invalid format operation %%%c", fmt[-1]); |
| 99 | |
| 100 | /* case 'b': */ |
| 101 | case 'd': |
| 102 | case 'o': |
| 103 | case 'x': |
| 104 | if (cnt == nargs) |
| 105 | error ("Format string wants too many arguments"); |
| 106 | sprintf (sprintf_buffer, fmtcpy, args[cnt++]); |
| 107 | /* Now copy into final output, truncating as nec. */ |
| 108 | string = sprintf_buffer; |
| 109 | goto doit; |
| 110 | |
| 111 | case 'f': |
| 112 | case 'e': |
| 113 | case 'g': |
| 114 | { |
| 115 | union { double d; char *half[2]; } u; |
| 116 | if (cnt + 1 == nargs) |
| 117 | error ("Format string wants too many arguments"); |
| 118 | u.half[0] = args[cnt++]; |
| 119 | u.half[1] = args[cnt++]; |
| 120 | sprintf (sprintf_buffer, fmtcpy, u.d); |
| 121 | /* Now copy into final output, truncating as nec. */ |
| 122 | string = sprintf_buffer; |
| 123 | goto doit; |
| 124 | } |
| 125 | |
| 126 | case 'S': |
| 127 | string[-1] = 's'; |
| 128 | case 's': |
| 129 | if (cnt == nargs) |
| 130 | error ("Format string wants too many arguments"); |
| 131 | string = args[cnt++]; |
| 132 | if (fmtcpy[1] != 's') |
| 133 | minlen = atoi (&fmtcpy[1]); |
| 134 | /* Copy string into final output, truncating if no room. */ |
| 135 | doit: |
| 136 | tem = strlen (string); |
| 137 | if (minlen > 0) |
| 138 | { |
| 139 | while (minlen > tem && bufsize > 0) |
| 140 | { |
| 141 | *bufptr++ = ' '; |
| 142 | bufsize--; |
| 143 | minlen--; |
| 144 | } |
| 145 | minlen = 0; |
| 146 | } |
| 147 | if (tem > bufsize) |
| 148 | tem = bufsize; |
| 149 | strncpy (bufptr, string, tem); |
| 150 | bufptr += tem; |
| 151 | bufsize -= tem; |
| 152 | if (minlen < 0) |
| 153 | { |
| 154 | while (minlen < - tem && bufsize > 0) |
| 155 | { |
| 156 | *bufptr++ = ' '; |
| 157 | bufsize--; |
| 158 | minlen++; |
| 159 | } |
| 160 | minlen = 0; |
| 161 | } |
| 162 | continue; |
| 163 | |
| 164 | case 'c': |
| 165 | if (cnt == nargs) |
| 166 | error ("Format string wants too many arguments"); |
| 167 | *bufptr++ = (int) args[cnt++]; |
| 168 | bufsize--; |
| 169 | continue; |
| 170 | |
| 171 | case '%': |
| 172 | fmt--; /* Drop thru and this % will be treated as normal */ |
| 173 | } |
| 174 | } |
| 175 | *bufptr++ = *fmt++; /* Just some characters; Copy 'em */ |
| 176 | bufsize--; |
| 177 | }; |
| 178 | |
| 179 | /* If we had to malloc something, free it. */ |
| 180 | if (big_buffer) |
| 181 | free (big_buffer); |
| 182 | |
| 183 | *bufptr = 0; /* Make sure our string end with a '\0' */ |
| 184 | return bufptr - buffer; |
| 185 | } |