352 lines
6.9 KiB
C
352 lines
6.9 KiB
C
/*
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* string.c - string support functions for cawf(1)
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*/
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/*
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* Copyright (c) 1991 Purdue University Research Foundation,
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* West Lafayette, Indiana 47907. All rights reserved.
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*
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* Written by Victor A. Abell <abe@mace.cc.purdue.edu>, Purdue
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* University Computing Center. Not derived from licensed software;
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* derived from awf(1) by Henry Spencer of the University of Toronto.
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*
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* Permission is granted to anyone to use this software for any
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* purpose on any computer system, and to alter it and redistribute
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* it freely, subject to the following restrictions:
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*
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* 1. The author is not responsible for any consequences of use of
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* this software, even if they arise from flaws in it.
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*
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* 2. The origin of this software must not be misrepresented, either
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* by explicit claim or by omission. Credits must appear in the
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* documentation.
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*
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* 3. Altered versions must be plainly marked as such, and must not
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* be misrepresented as being the original software. Credits must
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* appear in the documentation.
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*
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* 4. This notice may not be removed or altered.
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*/
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#include "cawf.h"
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#include <ctype.h>
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static void Setroman();
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/*
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* Asmname(s, c) - assemble name
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*/
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Asmname(s, c)
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unsigned char *s; /* pointer to name */
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unsigned char *c; /* code destination (c[3]) */
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{
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c[1] = c[2] = '\0';
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while (*s && *s == ' ')
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s++;
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if ((c[0] = *s) == '\0')
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return(0);
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return(((c[1] = s[1]) == '\0') ? 1 : 2);
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}
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/*
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* Delstr(sx) - delete string
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*/
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void
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Delstr(sx)
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int sx; /* string index */
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{
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char buf[MAXLINE]; /* message buffer */
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if (sx >= Nstr) {
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(void) sprintf(buf, " bad Delstr(%d) index", sx);
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Error(FATAL, LINE, buf, NULL);
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}
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Free(&Str[sx].str);
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while (sx < (Nstr - 1)) {
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Str[sx] = Str[sx + 1];
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sx++;
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}
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Nstr--;
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}
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/*
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* Endword() - end a word
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*/
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void
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Endword()
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{
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if (Fontstat != 'R')
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Setroman();
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Word[Wordx] = '\0';
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}
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/*
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* Findchar(nm, l, s, e) - find special character definition and
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* optionally enter it
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*/
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Findchar(nm, l, s, e)
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unsigned char *nm; /* character name */
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int l; /* effective length */
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unsigned char *s; /* value string */
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int e; /* 0 = find, don't enter
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* 1 = don't find, enter */
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{
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int cmp, hi, low, mid;
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unsigned char c[3];
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c[0] = nm[0];
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c[1] = (nm[1] == ' ' || nm[1] == '\t') ? '\0' : nm[1];
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c[2] = '\0';
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low = mid = 0;
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hi = Nsch - 1;
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while (low <= hi) {
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mid = (low + hi) / 2;
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if ((cmp = strncmp((char *)c, (char *)Schar[mid].nm, 2)) < 0)
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hi = mid - 1;
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else if (cmp > 0)
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low = mid + 1;
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else {
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if ( ! e)
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return(mid);
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Free(&Schar[mid].str);
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goto new_char;
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}
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}
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if ( ! e)
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return(-1);
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if (Nsch >= MAXSCH)
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Error(FATAL, LINE, " at character table limit", NULL);
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if (Nsch) {
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if (cmp > 0)
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mid++;
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for (hi = Nsch - 1; hi >= mid; hi--)
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Schar[hi+1] = Schar[hi];
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}
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Nsch++;
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Schar[mid].nm[0] = c[0];
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Schar[mid].nm[1] = c[1];
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new_char:
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Schar[mid].str = Newstr(s);
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Schar[mid].len = l;
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return(mid);
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}
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/*
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* Findhy(s, l, e) - find and optionally enter hyphen
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*/
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Findhy(s, l, e)
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unsigned char *s; /* value string */
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int l; /* equivalent length */
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int e; /* 0 = find, don't enter
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* 1 = enter, don't find */
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{
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int i;
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for (i = 0; i < Nhy; i++) {
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if (Font[0] == Hychar[i].font)
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break;
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}
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if (i >= Nhy) {
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if ( ! e)
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return(-1);
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if (Nhy >= MAXHYCH)
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Error(FATAL, LINE, " at hyphen limit for font ",
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(char *)Font);
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Hychar[i].font = Font[0];
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Nhy++;
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} else {
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if ( ! e)
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return(i);
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Error(WARN, LINE, " duplicate hyphen for font ", (char *)Font);
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Free(&Hychar[i].str);
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}
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Hychar[i].str = Newstr(s);
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Hychar[i].len = l;
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return(i);
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}
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/*
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* Findstr(nm, s, e) - find and optionally enter string in Str[]
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*/
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unsigned char *
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Findstr(nm, s, e)
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unsigned char *nm; /* 2 character string name */
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unsigned char *s; /* string value */
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int e; /* 0 = find, don't enter
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* 1 = enter, don't find */
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{
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unsigned char c[3]; /* character buffer */
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int cmp, hi, low, mid; /* binary search controls */
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int i; /* temporary indexes */
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unsigned char *s1, *s2; /* temporary string pointers */
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c[0] = nm[0];
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c[1] = (nm[1] == ' ' || nm[1] == '\t') ? '\0' : nm[1];
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c[2] = '\0';
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low = mid = 0;
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hi = Nstr - 1;
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Sx = -1;
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while (low <= hi) {
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mid = (low + hi) / 2;
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if ((cmp = strncmp((char *)c, (char *)Str[mid].nm, 2)) < 0)
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hi = mid - 1;
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else if (cmp > 0)
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low = mid + 1;
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else {
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Sx = mid;
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if ( ! e)
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return(Str[mid].str);
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Free(&Str[mid].str);
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goto new_string;
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}
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}
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if ( ! e)
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return((unsigned char *)"");
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if (Nstr >= MAXSTR)
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Error(FATAL, LINE, " out of space for string ", (char *)c);
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if (Nstr) {
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if (cmp > 0)
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mid++;
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for (hi = Nstr - 1; hi >= mid; hi--)
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Str[hi+1] = Str[hi];
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}
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Nstr++;
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Sx = mid;
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Str[mid].nm[0] = c[0];
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Str[mid].nm[1] = c[1];
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new_string:
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if (s == NULL)
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return (Str[mid].str = Newstr((unsigned char *)""));
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i = (*s == '"') ? 1 : 0;
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s1 = Str[mid].str = Newstr(s + i);
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if (i) {
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s2 = s1 + strlen((char *)s1);
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if (s2 > s1 && *(s2-1) == '"')
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*(s2-1) = '\0';
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}
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return(s1);
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}
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/*
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* Setroman() - set Roman font
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*/
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static void
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Setroman()
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{
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int i;
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if ((Wordx + Fstr.rl) >= MAXLINE)
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Error(WARN, LINE, " word too long", NULL);
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else {
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if (Fstr.r) {
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for (i = 0; i < Fstr.rl; i++) {
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Word[Wordx++] = Fstr.r[i];
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}
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}
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Fontstat = 'R';
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}
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}
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/*
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* Str2word(s, len) - copy len characters from string to Word[]
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*/
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Str2word(s, len)
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unsigned char *s;
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int len;
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{
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int i;
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for (; len > 0; len--, s++) {
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switch (Font[0]) {
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case 'B':
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case 'C':
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if (Fontctl == 0) {
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if ((Wordx + 5) >= MAXLINE) {
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word_too_long:
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Error(WARN, LINE, " word too long",
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NULL);
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return(1);
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}
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Word[Wordx++] = Trtbl[(int)*s];
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Word[Wordx++] = '\b';
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Word[Wordx++] = Trtbl[(int)*s];
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Word[Wordx++] = '\b';
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Word[Wordx++] = Trtbl[(int)*s];
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break;
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}
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if (Fontstat != Font[0]) {
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if (Fontstat != 'R')
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Setroman();
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if ((Wordx + Fstr.bl) >= MAXLINE)
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goto word_too_long;
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if (Fstr.b) {
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for (i = 0; i < Fstr.bl; i++) {
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Word[Wordx++] = Fstr.b[i];
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}
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}
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Fontstat = Font[0];
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}
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if ((Wordx + 1) >= MAXLINE)
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goto word_too_long;
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Word[Wordx++] = Trtbl[(int)*s];
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break;
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case 'I':
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if (isalnum(*s)) {
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if (Fontctl == 0) {
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if ((Wordx + 3) >= MAXLINE)
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goto word_too_long;
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Word[Wordx++] = '_';
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Word[Wordx++] = '\b';
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Word[Wordx++] = Trtbl[(int)*s];
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break;
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}
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if (Fontstat != 'I') {
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if (Fontstat != 'R')
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Setroman();
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if ((Wordx + Fstr.itl) >= MAXLINE)
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goto word_too_long;
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if (Fstr.it) {
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for (i = 0; i < Fstr.itl; i++) {
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Word[Wordx++] = Fstr.it[i];
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}
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}
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Fontstat = 'I';
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}
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if ((Wordx + 1) >= MAXLINE)
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goto word_too_long;
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Word[Wordx++] = Trtbl[(int)*s];
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break;
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}
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/* else fall through */
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default:
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if (Fontstat != 'R')
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Setroman();
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if ((Wordx + 1) >= MAXLINE)
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goto word_too_long;
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Word[Wordx++] = Trtbl[(int)*s];
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}
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}
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return(0);
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}
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