286 lines
7.2 KiB
C
286 lines
7.2 KiB
C
/* Merge parameters into a termcap entry string.
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Copyright (C) 1985, 1987, 1993, 1995, 2000-2008, 2013-2024 Free
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Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Emacs config.h may rename various library functions such as malloc. */
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#include <config.h>
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#include "lisp.h" /* for xmalloc */
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#include "tparam.h"
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/* Assuming STRING is the value of a termcap string entry
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containing `%' constructs to expand parameters,
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merge in parameter values and store result in block OUTSTRING points to.
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LEN is the length of OUTSTRING. If more space is needed,
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a block is allocated with `malloc'.
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The value returned is the address of the resulting string.
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This may be OUTSTRING or may be the address of a block got with `malloc'.
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In the latter case, the caller must free the block.
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The fourth and following args to tparam serve as the parameter values. */
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static char *tparam1 (char const *string, char *outstring, int len,
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char *up, char *left, int *argp);
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char *
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tparam (const char *string, char *outstring, int len,
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int arg0, int arg1, int arg2, int arg3)
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{
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int arg[4];
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arg[0] = arg0;
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arg[1] = arg1;
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arg[2] = arg2;
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arg[3] = arg3;
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return tparam1 (string, outstring, len, NULL, NULL, arg);
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}
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char *BC;
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char *UP;
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static char tgoto_buf[50];
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char *
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tgoto (const char *cm, int hpos, int vpos)
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{
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int args[2];
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if (!cm)
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return NULL;
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args[0] = vpos;
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args[1] = hpos;
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return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
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}
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static char *
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tparam1 (const char *string, char *outstring, int len,
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char *up, char *left, register int *argp)
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{
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register int c;
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register const char *p = string;
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register char *op = outstring;
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char *outend;
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char *new = 0;
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ptrdiff_t outlen = 0;
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register int tem;
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int *old_argp = argp; /* can move */
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int *fixed_argp = argp; /* never moves */
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bool explicit_param_p = false; /* set by %p */
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ptrdiff_t doleft = 0;
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ptrdiff_t doup = 0;
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ptrdiff_t append_len = 0;
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outend = outstring + len;
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while (true)
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{
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/* If the buffer might be too short, make it bigger. */
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while (outend - op - append_len <= 5)
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{
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ptrdiff_t offset = op - outstring;
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if (outlen == 0)
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{
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outlen = len + 40;
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new = xmalloc (outlen);
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memcpy (new, outstring, offset);
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}
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else
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{
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new = xpalloc (outstring, &outlen, 1, -1, 1);
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}
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op = new + offset;
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outend = new + outlen;
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outstring = new;
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}
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c = *p++;
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if (!c)
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break;
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if (c == '%')
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{
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c = *p++;
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if (explicit_param_p)
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explicit_param_p = false;
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else
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tem = *argp;
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switch (c)
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{
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case 'd': /* %d means output in decimal. */
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if (tem < 10)
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goto onedigit;
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if (tem < 100)
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goto twodigit;
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FALLTHROUGH;
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case '3': /* %3 means output in decimal, 3 digits. */
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if (tem > 999)
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{
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*op++ = tem / 1000 + '0';
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tem %= 1000;
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}
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*op++ = tem / 100 + '0';
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FALLTHROUGH;
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case '2': /* %2 means output in decimal, 2 digits. */
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twodigit:
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tem %= 100;
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*op++ = tem / 10 + '0';
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onedigit:
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*op++ = tem % 10 + '0';
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argp++;
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break;
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case 'p': /* %pN means use param N for next subst. */
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tem = fixed_argp[(*p++) - '1'];
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explicit_param_p = true;
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break;
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case 'C':
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/* For c-100: print quotient of value by 96, if nonzero,
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then do like %+. */
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if (tem >= 96)
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{
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*op++ = tem / 96;
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tem %= 96;
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}
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FALLTHROUGH;
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case '+': /* %+x means add character code of char x. */
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tem += *p++;
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FALLTHROUGH;
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case '.': /* %. means output as character. */
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if (left)
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{
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/* If want to forbid output of 0 and \n and \t,
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and this is one of them, increment it. */
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while (tem == 0 || tem == '\n' || tem == '\t')
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{
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ptrdiff_t append_len_incr;
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tem++;
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if (argp == old_argp)
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doup++, append_len_incr = strlen (up);
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else
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doleft++, append_len_incr = strlen (left);
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if (ckd_add (&append_len, append_len, append_len_incr))
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memory_full (SIZE_MAX);
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}
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}
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*op++ = tem ? tem : 0200;
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FALLTHROUGH;
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case 'f': /* %f means discard next arg. */
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argp++;
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break;
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case 'b': /* %b means back up one arg (and reuse it). */
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argp--;
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break;
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case 'r': /* %r means interchange following two args. */
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argp[0] = argp[1];
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argp[1] = tem;
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old_argp++;
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break;
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case '>': /* %>xy means if arg is > char code of x, */
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if (argp[0] > *p++) /* then add char code of y to the arg, */
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argp[0] += *p; /* and in any case don't output. */
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p++; /* Leave the arg to be output later. */
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break;
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case 'a': /* %a means arithmetic. */
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/* Next character says what operation.
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Add or subtract either a constant or some other arg. */
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/* First following character is + to add or - to subtract
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or = to assign. */
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/* Next following char is 'p' and an arg spec
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(0100 plus position of that arg relative to this one)
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or 'c' and a constant stored in a character. */
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tem = p[2] & 0177;
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if (p[1] == 'p')
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tem = argp[tem - 0100];
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if (p[0] == '-')
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argp[0] -= tem;
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else if (p[0] == '+')
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argp[0] += tem;
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else if (p[0] == '*')
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argp[0] *= tem;
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else if (p[0] == '/')
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argp[0] /= tem;
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else
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argp[0] = tem;
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p += 3;
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break;
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case 'i': /* %i means add one to arg, */
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argp[0] ++; /* and leave it to be output later. */
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argp[1] ++; /* Increment the following arg, too! */
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break;
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case '%': /* %% means output %; no arg. */
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goto ordinary;
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case 'n': /* %n means xor each of next two args with 140. */
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argp[0] ^= 0140;
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argp[1] ^= 0140;
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break;
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case 'm': /* %m means xor each of next two args with 177. */
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argp[0] ^= 0177;
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argp[1] ^= 0177;
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break;
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case 'B': /* %B means express arg as BCD char code. */
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argp[0] += 6 * (tem / 10);
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break;
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case 'D': /* %D means weird Delta Data transformation. */
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argp[0] -= 2 * (tem % 16);
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break;
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default:
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emacs_abort ();
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}
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}
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else
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/* Ordinary character in the argument string. */
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ordinary:
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*op++ = c;
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}
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*op = 0;
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while (doup-- > 0)
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op = stpcpy (op, up);
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while (doleft-- > 0)
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op = stpcpy (op, left);
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return outstring;
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}
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#ifdef DEBUG
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int
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main (int argc, char **argv)
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{
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char buf[50];
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int args[3];
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args[0] = atoi (argv[2]);
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args[1] = atoi (argv[3]);
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args[2] = atoi (argv[4]);
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tparam1 (argv[1], buf, 50, "LEFT", "UP", args);
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printf ("%s\n", buf);
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return 0;
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}
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#endif /* DEBUG */
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