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