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toke.c
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toke.c
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/* $Header: toke.c,v 2.0 88/06/05 00:11:16 root Exp $
*
* $Log: toke.c,v $
* Revision 2.0 88/06/05 00:11:16 root
* Baseline version 2.0.
*
*/
#include "EXTERN.h"
#include "perl.h"
#include "perly.h"
#define CLINE (cmdline = (line < cmdline ? line : cmdline))
#define RETURN(retval) return (bufptr = s,(int)retval)
#define OPERATOR(retval) return (expectterm = TRUE,bufptr = s,(int)retval)
#define TERM(retval) return (CLINE, expectterm = FALSE,bufptr = s,(int)retval)
#define LOOPX(f) return(yylval.ival=f,expectterm = FALSE,bufptr = s,(int)LOOPEX)
#define UNI(f) return(yylval.ival = f,expectterm = TRUE,bufptr = s,(int)UNIOP)
#define FTST(f) return(yylval.ival=f,expectterm = TRUE,bufptr = s,(int)FILETEST)
#define FUN0(f) return(yylval.ival = f,expectterm = FALSE,bufptr = s,(int)FUNC0)
#define FUN1(f) return(yylval.ival = f,expectterm = FALSE,bufptr = s,(int)FUNC1)
#define FUN2(f) return(yylval.ival = f,expectterm = FALSE,bufptr = s,(int)FUNC2)
#define FUN3(f) return(yylval.ival = f,expectterm = FALSE,bufptr = s,(int)FUNC3)
#define SFUN(f) return(yylval.ival=f,expectterm = FALSE,bufptr = s,(int)STABFUN)
#define LFUN(f) return(yylval.ival=f,expectterm = FALSE,bufptr = s,(int)LVALFUN)
yylex()
{
register char *s = bufptr;
register char *d;
register int tmp;
static bool in_format = FALSE;
static bool firstline = TRUE;
retry:
#ifdef YYDEBUG
if (yydebug)
if (index(s,'\n'))
fprintf(stderr,"Tokener at %s",s);
else
fprintf(stderr,"Tokener at %s\n",s);
#endif
switch (*s) {
default:
fprintf(stderr,
"Unrecognized character %c in file %s line %ld--ignoring.\n",
*s++,filename,(long)line);
goto retry;
case 0:
s = str_get(linestr);
*s = '\0';
if (firstline && (minus_n || minus_p)) {
firstline = FALSE;
str_set(linestr,"line: while (<>) {");
if (minus_a)
str_cat(linestr,"@F=split(' ');");
s = str_get(linestr);
goto retry;
}
if (!rsfp)
RETURN(0);
if (in_format) {
yylval.formval = load_format(); /* leaves . in buffer */
in_format = FALSE;
s = str_get(linestr);
TERM(FORMLIST);
}
line++;
if ((s = str_gets(linestr, rsfp)) == Nullch) {
if (preprocess)
pclose(rsfp);
else if (rsfp != stdin)
fclose(rsfp);
rsfp = Nullfp;
if (minus_n || minus_p) {
str_set(linestr,minus_p ? "}continue{print;" : "");
str_cat(linestr,"}");
s = str_get(linestr);
goto retry;
}
s = str_get(linestr);
RETURN(0);
}
#ifdef DEBUG
else if (firstline) {
char *showinput();
s = showinput();
}
#endif
firstline = FALSE;
goto retry;
case ' ': case '\t': case '\f':
s++;
goto retry;
case '\n':
case '#':
if (preprocess && s == str_get(linestr) &&
s[1] == ' ' && isdigit(s[2])) {
line = atoi(s+2)-1;
for (s += 2; isdigit(*s); s++) ;
while (*s && isspace(*s)) s++;
if (filename)
safefree(filename);
s[strlen(s)-1] = '\0'; /* wipe out newline */
if (*s == '"') {
s++;
s[strlen(s)-1] = '\0'; /* wipe out trailing quote */
}
if (*s)
filename = savestr(s);
else
filename = savestr(origfilename);
s = str_get(linestr);
}
if (in_eval) {
while (*s && *s != '\n')
s++;
if (*s)
s++;
line++;
}
else
*s = '\0';
if (lex_newlines)
RETURN('\n');
goto retry;
case '-':
if (s[1] && isalpha(s[1]) && !isalpha(s[2])) {
s++;
switch (*s++) {
case 'r': FTST(O_FTEREAD);
case 'w': FTST(O_FTEWRITE);
case 'x': FTST(O_FTEEXEC);
case 'o': FTST(O_FTEOWNED);
case 'R': FTST(O_FTRREAD);
case 'W': FTST(O_FTRWRITE);
case 'X': FTST(O_FTREXEC);
case 'O': FTST(O_FTROWNED);
case 'e': FTST(O_FTIS);
case 'z': FTST(O_FTZERO);
case 's': FTST(O_FTSIZE);
case 'f': FTST(O_FTFILE);
case 'd': FTST(O_FTDIR);
case 'l': FTST(O_FTLINK);
case 'p': FTST(O_FTPIPE);
case 'S': FTST(O_FTSOCK);
case 'u': FTST(O_FTSUID);
case 'g': FTST(O_FTSGID);
case 'k': FTST(O_FTSVTX);
case 'b': FTST(O_FTBLK);
case 'c': FTST(O_FTCHR);
case 't': FTST(O_FTTTY);
case 'T': FTST(O_FTTEXT);
case 'B': FTST(O_FTBINARY);
default:
s -= 2;
break;
}
}
/*FALL THROUGH*/
case '+':
if (s[1] == *s) {
s++;
if (*s++ == '+')
RETURN(INC);
else
RETURN(DEC);
}
/* FALL THROUGH */
case '*':
case '%':
case '^':
case '~':
case '(':
case ',':
case ':':
case '[':
tmp = *s++;
OPERATOR(tmp);
case '{':
tmp = *s++;
if (isspace(*s) || *s == '#')
cmdline = NOLINE; /* invalidate current command line number */
OPERATOR(tmp);
case ';':
if (line < cmdline)
cmdline = line;
tmp = *s++;
OPERATOR(tmp);
case ')':
case ']':
tmp = *s++;
TERM(tmp);
case '}':
tmp = *s++;
for (d = s; *d == ' ' || *d == '\t'; d++) ;
if (*d == '\n' || *d == '#')
OPERATOR(tmp); /* block end */
else
TERM(tmp); /* associative array end */
case '&':
s++;
tmp = *s++;
if (tmp == '&')
OPERATOR(ANDAND);
s--;
OPERATOR('&');
case '|':
s++;
tmp = *s++;
if (tmp == '|')
OPERATOR(OROR);
s--;
OPERATOR('|');
case '=':
s++;
tmp = *s++;
if (tmp == '=')
OPERATOR(EQ);
if (tmp == '~')
OPERATOR(MATCH);
s--;
OPERATOR('=');
case '!':
s++;
tmp = *s++;
if (tmp == '=')
OPERATOR(NE);
if (tmp == '~')
OPERATOR(NMATCH);
s--;
OPERATOR('!');
case '<':
if (expectterm) {
s = scanstr(s);
TERM(RSTRING);
}
s++;
tmp = *s++;
if (tmp == '<')
OPERATOR(LS);
if (tmp == '=')
OPERATOR(LE);
s--;
OPERATOR('<');
case '>':
s++;
tmp = *s++;
if (tmp == '>')
OPERATOR(RS);
if (tmp == '=')
OPERATOR(GE);
s--;
OPERATOR('>');
#define SNARFWORD \
d = tokenbuf; \
while (isalpha(*s) || isdigit(*s) || *s == '_') \
*d++ = *s++; \
*d = '\0'; \
d = tokenbuf;
case '$':
if (s[1] == '#' && (isalpha(s[2]) || s[2] == '_')) {
s++;
s = scanreg(s,tokenbuf);
yylval.stabval = aadd(stabent(tokenbuf,TRUE));
TERM(ARYLEN);
}
s = scanreg(s,tokenbuf);
yylval.stabval = stabent(tokenbuf,TRUE);
TERM(REG);
case '@':
s = scanreg(s,tokenbuf);
yylval.stabval = aadd(stabent(tokenbuf,TRUE));
TERM(ARY);
case '/': /* may either be division or pattern */
case '?': /* may either be conditional or pattern */
if (expectterm) {
s = scanpat(s);
TERM(PATTERN);
}
tmp = *s++;
OPERATOR(tmp);
case '.':
if (!expectterm || !isdigit(s[1])) {
s++;
tmp = *s++;
if (tmp == '.')
OPERATOR(DOTDOT);
s--;
OPERATOR('.');
}
/* FALL THROUGH */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case '\'': case '"': case '`':
s = scanstr(s);
TERM(RSTRING);
case '_':
SNARFWORD;
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'a': case 'A':
SNARFWORD;
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'b': case 'B':
SNARFWORD;
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'c': case 'C':
SNARFWORD;
if (strEQ(d,"continue"))
OPERATOR(CONTINUE);
if (strEQ(d,"chdir"))
UNI(O_CHDIR);
if (strEQ(d,"close"))
OPERATOR(CLOSE);
if (strEQ(d,"crypt"))
FUN2(O_CRYPT);
if (strEQ(d,"chop"))
LFUN(O_CHOP);
if (strEQ(d,"chmod")) {
yylval.ival = O_CHMOD;
OPERATOR(LISTOP);
}
if (strEQ(d,"chown")) {
yylval.ival = O_CHOWN;
OPERATOR(LISTOP);
}
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'd': case 'D':
SNARFWORD;
if (strEQ(d,"do"))
OPERATOR(DO);
if (strEQ(d,"die"))
UNI(O_DIE);
if (strEQ(d,"delete"))
OPERATOR(DELETE);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'e': case 'E':
SNARFWORD;
if (strEQ(d,"else"))
OPERATOR(ELSE);
if (strEQ(d,"elsif")) {
yylval.ival = line;
OPERATOR(ELSIF);
}
if (strEQ(d,"eq") || strEQ(d,"EQ"))
OPERATOR(SEQ);
if (strEQ(d,"exit"))
UNI(O_EXIT);
if (strEQ(d,"eval")) {
allstabs = TRUE; /* must initialize everything since */
UNI(O_EVAL); /* we don't know what will be used */
}
if (strEQ(d,"eof"))
TERM(FEOF);
if (strEQ(d,"exp"))
FUN1(O_EXP);
if (strEQ(d,"each"))
SFUN(O_EACH);
if (strEQ(d,"exec")) {
yylval.ival = O_EXEC;
OPERATOR(LISTOP);
}
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'f': case 'F':
SNARFWORD;
if (strEQ(d,"for"))
OPERATOR(FOR);
if (strEQ(d,"foreach"))
OPERATOR(FOR);
if (strEQ(d,"format")) {
in_format = TRUE;
OPERATOR(FORMAT);
}
if (strEQ(d,"fork"))
FUN0(O_FORK);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'g': case 'G':
SNARFWORD;
if (strEQ(d,"gt") || strEQ(d,"GT"))
OPERATOR(SGT);
if (strEQ(d,"ge") || strEQ(d,"GE"))
OPERATOR(SGE);
if (strEQ(d,"goto"))
LOOPX(O_GOTO);
if (strEQ(d,"gmtime"))
FUN1(O_GMTIME);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'h': case 'H':
SNARFWORD;
if (strEQ(d,"hex"))
FUN1(O_HEX);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'i': case 'I':
SNARFWORD;
if (strEQ(d,"if")) {
yylval.ival = line;
OPERATOR(IF);
}
if (strEQ(d,"index"))
FUN2(O_INDEX);
if (strEQ(d,"int"))
FUN1(O_INT);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'j': case 'J':
SNARFWORD;
if (strEQ(d,"join"))
OPERATOR(JOIN);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'k': case 'K':
SNARFWORD;
if (strEQ(d,"keys"))
SFUN(O_KEYS);
if (strEQ(d,"kill")) {
yylval.ival = O_KILL;
OPERATOR(LISTOP);
}
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'l': case 'L':
SNARFWORD;
if (strEQ(d,"last"))
LOOPX(O_LAST);
if (strEQ(d,"local"))
OPERATOR(LOCAL);
if (strEQ(d,"length"))
FUN1(O_LENGTH);
if (strEQ(d,"lt") || strEQ(d,"LT"))
OPERATOR(SLT);
if (strEQ(d,"le") || strEQ(d,"LE"))
OPERATOR(SLE);
if (strEQ(d,"localtime"))
FUN1(O_LOCALTIME);
if (strEQ(d,"log"))
FUN1(O_LOG);
if (strEQ(d,"link"))
FUN2(O_LINK);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'm': case 'M':
SNARFWORD;
if (strEQ(d,"m")) {
s = scanpat(s-1);
TERM(PATTERN);
}
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'n': case 'N':
SNARFWORD;
if (strEQ(d,"next"))
LOOPX(O_NEXT);
if (strEQ(d,"ne") || strEQ(d,"NE"))
OPERATOR(SNE);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'o': case 'O':
SNARFWORD;
if (strEQ(d,"open"))
OPERATOR(OPEN);
if (strEQ(d,"ord"))
FUN1(O_ORD);
if (strEQ(d,"oct"))
FUN1(O_OCT);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'p': case 'P':
SNARFWORD;
if (strEQ(d,"print")) {
yylval.ival = O_PRINT;
OPERATOR(LISTOP);
}
if (strEQ(d,"printf")) {
yylval.ival = O_PRTF;
OPERATOR(LISTOP);
}
if (strEQ(d,"push")) {
yylval.ival = O_PUSH;
OPERATOR(PUSH);
}
if (strEQ(d,"pop"))
OPERATOR(POP);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'q': case 'Q':
SNARFWORD;
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'r': case 'R':
SNARFWORD;
if (strEQ(d,"reset"))
UNI(O_RESET);
if (strEQ(d,"redo"))
LOOPX(O_REDO);
if (strEQ(d,"rename"))
FUN2(O_RENAME);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 's': case 'S':
SNARFWORD;
if (strEQ(d,"s")) {
s = scansubst(s);
TERM(SUBST);
}
if (strEQ(d,"shift"))
TERM(SHIFT);
if (strEQ(d,"split"))
TERM(SPLIT);
if (strEQ(d,"substr"))
FUN3(O_SUBSTR);
if (strEQ(d,"sprintf"))
OPERATOR(SPRINTF);
if (strEQ(d,"sub"))
OPERATOR(SUB);
if (strEQ(d,"select"))
OPERATOR(SELECT);
if (strEQ(d,"seek"))
OPERATOR(SEEK);
if (strEQ(d,"stat"))
OPERATOR(STAT);
if (strEQ(d,"study")) {
sawstudy++;
LFUN(O_STUDY);
}
if (strEQ(d,"sqrt"))
FUN1(O_SQRT);
if (strEQ(d,"sleep"))
UNI(O_SLEEP);
if (strEQ(d,"system")) {
yylval.ival = O_SYSTEM;
OPERATOR(LISTOP);
}
if (strEQ(d,"symlink"))
FUN2(O_SYMLINK);
if (strEQ(d,"sort")) {
yylval.ival = O_SORT;
OPERATOR(LISTOP);
}
yylval.cval = savestr(d);
OPERATOR(WORD);
case 't': case 'T':
SNARFWORD;
if (strEQ(d,"tr")) {
s = scantrans(s);
TERM(TRANS);
}
if (strEQ(d,"tell"))
TERM(TELL);
if (strEQ(d,"time"))
FUN0(O_TIME);
if (strEQ(d,"times"))
FUN0(O_TMS);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'u': case 'U':
SNARFWORD;
if (strEQ(d,"using"))
OPERATOR(USING);
if (strEQ(d,"until")) {
yylval.ival = line;
OPERATOR(UNTIL);
}
if (strEQ(d,"unless")) {
yylval.ival = line;
OPERATOR(UNLESS);
}
if (strEQ(d,"umask"))
FUN1(O_UMASK);
if (strEQ(d,"unshift")) {
yylval.ival = O_UNSHIFT;
OPERATOR(PUSH);
}
if (strEQ(d,"unlink")) {
yylval.ival = O_UNLINK;
OPERATOR(LISTOP);
}
if (strEQ(d,"utime")) {
yylval.ival = O_UTIME;
OPERATOR(LISTOP);
}
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'v': case 'V':
SNARFWORD;
if (strEQ(d,"values"))
SFUN(O_VALUES);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'w': case 'W':
SNARFWORD;
if (strEQ(d,"write"))
TERM(WRITE);
if (strEQ(d,"while")) {
yylval.ival = line;
OPERATOR(WHILE);
}
if (strEQ(d,"wait"))
FUN0(O_WAIT);
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'x': case 'X':
SNARFWORD;
if (!expectterm && strEQ(d,"x"))
OPERATOR('x');
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'y': case 'Y':
SNARFWORD;
if (strEQ(d,"y")) {
s = scantrans(s);
TERM(TRANS);
}
yylval.cval = savestr(d);
OPERATOR(WORD);
case 'z': case 'Z':
SNARFWORD;
yylval.cval = savestr(d);
OPERATOR(WORD);
}
}
char *
scanreg(s,dest)
register char *s;
char *dest;
{
register char *d;
s++;
d = dest;
if (isdigit(*s)) {
while (isdigit(*s) || *s == '_')
*d++ = *s++;
}
else {
while (isalpha(*s) || isdigit(*s) || *s == '_')
*d++ = *s++;
}
*d = '\0';
d = dest;
if (!*d) {
*d = *s++;
if (*d == '{') {
d = dest;
while (*s && *s != '}')
*d++ = *s++;
*d = '\0';
d = dest;
if (*s)
s++;
}
else
d[1] = '\0';
}
if (*d == '^' && !isspace(*s))
*d = *s++ & 31;
return s;
}
STR *
scanconst(string)
char *string;
{
register STR *retstr;
register char *t;
register char *d;
if (index(string,'|')) {
return Nullstr;
}
retstr = str_make(string);
t = str_get(retstr);
*(long*)&retstr->str_nval = 100;
for (d=t; *d; ) {
switch (*d) {
case '.': case '[': case '$': case '(': case ')': case '|':
*d = '\0';
break;
case '\\':
if (index("wWbB0123456789sSdD",d[1])) {
*d = '\0';
break;
}
strcpy(d,d+1);
switch(*d) {
case 'n':
*d = '\n';
break;
case 't':
*d = '\t';
break;
case 'f':
*d = '\f';
break;
case 'r':
*d = '\r';
break;
}
/* FALL THROUGH */
default:
if (d[1] == '*' || d[1] == '+' || d[1] == '?') {
*d = '\0';
break;
}
d++;
}
}
if (!*t) {
str_free(retstr);
return Nullstr;
}
retstr->str_cur = strlen(retstr->str_ptr);
return retstr;
}
char *
scanpat(s)
register char *s;
{
register SPAT *spat = (SPAT *) safemalloc(sizeof (SPAT));
register char *d;
bzero((char *)spat, sizeof(SPAT));
spat->spat_next = spat_root; /* link into spat list */
spat_root = spat;
switch (*s++) {
case 'm':
s++;
break;
case '/':
break;
case '?':
spat->spat_flags |= SPAT_ONCE;
break;
default:
fatal("panic: scanpat");
}
s = cpytill(tokenbuf,s,s[-1]);
if (!*s)
fatal("Search pattern not terminated");
s++;
if (*s == 'i') {
s++;
spat->spat_flags |= SPAT_FOLD;
}
for (d=tokenbuf; *d; d++) {
if (*d == '$' && d[1] && d[-1] != '\\' && d[1] != '|') {
register ARG *arg;
spat->spat_runtime = arg = op_new(1);
arg->arg_type = O_ITEM;
arg[1].arg_type = A_DOUBLE;
arg[1].arg_ptr.arg_str = str_make(tokenbuf);
goto got_pat; /* skip compiling for now */
}
}
if (!(spat->spat_flags & SPAT_FOLD)) {
if (*tokenbuf == '^') {
spat->spat_short = scanconst(tokenbuf+1);
if (spat->spat_short) {
spat->spat_slen = strlen(spat->spat_short->str_ptr);
if (spat->spat_slen == strlen(tokenbuf+1))
spat->spat_flags |= SPAT_ALL;
}
}
else {
spat->spat_flags |= SPAT_SCANFIRST;
spat->spat_short = scanconst(tokenbuf);
if (spat->spat_short) {
spat->spat_slen = strlen(spat->spat_short->str_ptr);
if (spat->spat_slen == strlen(tokenbuf))
spat->spat_flags |= SPAT_ALL;
}
}
}
spat->spat_regexp = regcomp(tokenbuf,spat->spat_flags & SPAT_FOLD,1);
hoistmust(spat);
got_pat:
yylval.arg = make_match(O_MATCH,stab2arg(A_STAB,defstab),spat);
return s;
}
char *
scansubst(s)
register char *s;
{
register SPAT *spat = (SPAT *) safemalloc(sizeof (SPAT));
register char *d;
bzero((char *)spat, sizeof(SPAT));
spat->spat_next = spat_root; /* link into spat list */
spat_root = spat;
s = cpytill(tokenbuf,s+1,*s);
if (!*s)
fatal("Substitution pattern not terminated");
for (d=tokenbuf; *d; d++) {
if (*d == '$' && d[1] && d[-1] != '\\' && d[1] != '|') {
register ARG *arg;
spat->spat_runtime = arg = op_new(1);
arg->arg_type = O_ITEM;
arg[1].arg_type = A_DOUBLE;
arg[1].arg_ptr.arg_str = str_make(tokenbuf);
goto get_repl; /* skip compiling for now */
}
}
if (*tokenbuf == '^') {
spat->spat_short = scanconst(tokenbuf+1);
if (spat->spat_short)
spat->spat_slen = strlen(spat->spat_short->str_ptr);
}
else {
spat->spat_flags |= SPAT_SCANFIRST;
spat->spat_short = scanconst(tokenbuf);
if (spat->spat_short)
spat->spat_slen = strlen(spat->spat_short->str_ptr);
}
d = savestr(tokenbuf);
get_repl:
s = scanstr(s);
if (!*s)
fatal("Substitution replacement not terminated");
spat->spat_repl = yylval.arg;
spat->spat_flags |= SPAT_ONCE;
while (*s == 'g' || *s == 'i') {
if (*s == 'g') {
s++;
spat->spat_flags &= ~SPAT_ONCE;
}
if (*s == 'i') {
s++;
spat->spat_flags |= SPAT_FOLD;
}
}
if (!spat->spat_runtime) {
spat->spat_regexp = regcomp(d, spat->spat_flags & SPAT_FOLD,1);
hoistmust(spat);
safefree(d);
}
if (spat->spat_flags & SPAT_FOLD) { /* Oops, disable optimization */
str_free(spat->spat_short);
spat->spat_short = Nullstr;
spat->spat_slen = 0;
}
yylval.arg = make_match(O_SUBST,stab2arg(A_STAB,defstab),spat);
return s;
}
hoistmust(spat)
register SPAT *spat;
{
if (spat->spat_regexp->regmust) { /* is there a better short-circuit? */
if (spat->spat_short &&
strEQ(spat->spat_short->str_ptr,spat->spat_regexp->regmust->str_ptr)){
if (spat->spat_flags & SPAT_SCANFIRST) {
str_free(spat->spat_short);
spat->spat_short = Nullstr;
}
else {
str_free(spat->spat_regexp->regmust);
spat->spat_regexp->regmust = Nullstr;
return;
}
}
if (!spat->spat_short || /* promote the better string */
((spat->spat_flags & SPAT_SCANFIRST) &&
(spat->spat_short->str_cur < spat->spat_regexp->regmust->str_cur) )){
str_free(spat->spat_short); /* ok if null */
spat->spat_short = spat->spat_regexp->regmust;
spat->spat_regexp->regmust = Nullstr;
spat->spat_flags |= SPAT_SCANFIRST;
}
}
}
char *
expand_charset(s)
register char *s;
{
char t[512];
register char *d = t;
register int i;
while (*s) {
if (s[1] == '-' && s[2]) {
for (i = s[0]; i <= s[2]; i++)
*d++ = i;
s += 3;
}
else
*d++ = *s++;
}
*d = '\0';
return savestr(t);
}
char *
scantrans(s)
register char *s;
{
ARG *arg =
l(make_op(O_TRANS,2,stab2arg(A_STAB,defstab),Nullarg,Nullarg,0));
register char *t;
register char *r;
register char *tbl = safemalloc(256);
register int i;
arg[2].arg_type = A_NULL;
arg[2].arg_ptr.arg_cval = tbl;
for (i=0; i<256; i++)
tbl[i] = 0;
s = scanstr(s);
if (!*s)
fatal("Translation pattern not terminated");
t = expand_charset(str_get(yylval.arg[1].arg_ptr.arg_str));
free_arg(yylval.arg);
s = scanstr(s-1);
if (!*s)
fatal("Translation replacement not terminated");
r = expand_charset(str_get(yylval.arg[1].arg_ptr.arg_str));
free_arg(yylval.arg);
yylval.arg = arg;
if (!*r) {
safefree(r);
r = t;
}
for (i = 0; t[i]; i++) {
if (!r[i])
r[i] = r[i-1];
tbl[t[i] & 0377] = r[i];
}
if (r != t)
safefree(r);
safefree(t);
return s;
}
char *
scanstr(s)
register char *s;
{
register char term;
register char *d;
register ARG *arg;
register bool makesingle = FALSE;
register STAB *stab;
char *leave = "\\$nrtfb0123456789"; /* which backslash sequences to keep */
arg = op_new(1);
yylval.arg = arg;
arg->arg_type = O_ITEM;
switch (*s) {
default: /* a substitution replacement */
arg[1].arg_type = A_DOUBLE;
makesingle = TRUE; /* maybe disable runtime scanning */
term = *s;
if (term == '\'')
leave = Nullch;
goto snarf_it;
case '0':
{
long i;
int shift;
arg[1].arg_type = A_SINGLE;
if (s[1] == 'x') {
shift = 4;
s += 2;
}
else if (s[1] == '.')
goto decimal;
else
shift = 3;
i = 0;
for (;;) {
switch (*s) {
default:
goto out;
case '8': case '9':
if (shift != 4)
fatal("Illegal octal digit");