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lex.c
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/****************************************************************
Copyright 1990, 1992 - 1997, 1999, 2000 by AT&T, Lucent Technologies and Bellcore.
Permission to use, copy, modify, and distribute this software
and its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the names of AT&T, Bell Laboratories,
Lucent or Bellcore or any of their entities not be used in
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
AT&T, Lucent and Bellcore disclaim all warranties with regard to
this software, including all implied warranties of
merchantability and fitness. In no event shall AT&T, Lucent or
Bellcore be liable for any special, indirect or consequential
damages or any damages whatsoever resulting from loss of use,
data or profits, whether in an action of contract, negligence or
other tortious action, arising out of or in connection with the
use or performance of this software.
****************************************************************/
#include "defs.h"
#include "tokdefs.h"
#include "p1defs.h"
#ifdef _WIN32
#undef MSDOS
#define MSDOS
#endif
#ifdef NO_EOF_CHAR_CHECK
#undef EOF_CHAR
#else
#ifndef EOF_CHAR
#define EOF_CHAR 26 /* ASCII control-Z */
#endif
#endif
#define BLANK ' '
#define MYQUOTE (2)
#define SEOF 0
/* card types */
#define STEOF 1
#define STINITIAL 2
#define STCONTINUE 3
/* lex states */
#define NEWSTMT 1
#define FIRSTTOKEN 2
#define OTHERTOKEN 3
#define RETEOS 4
LOCAL int stkey; /* Type of the current statement (DO, END, IF, etc) */
static int needwkey;
ftnint yystno;
flag intonly;
extern int new_dcl;
LOCAL long int stno;
LOCAL long int nxtstno; /* Statement label */
LOCAL int parlev; /* Parentheses level */
LOCAL int parseen;
LOCAL int expcom;
LOCAL int expeql;
LOCAL char *nextch;
LOCAL char *lastch;
LOCAL char *nextcd = NULL;
LOCAL char *endcd;
LOCAL long prevlin;
LOCAL long thislin;
LOCAL int code; /* Card type; INITIAL, CONTINUE or EOF */
LOCAL int lexstate = NEWSTMT;
LOCAL char *sbuf; /* Main buffer for Fortran source input. */
LOCAL char *send; /* Was = sbuf+20*66 with sbuf[1390]. */
LOCAL char *shend; /* reflects elbow room for #line lines */
LOCAL int maxcont;
LOCAL int nincl = 0; /* Current number of include files */
LOCAL long firstline;
LOCAL char *infname1, *infname2, *laststb, *stb0;
extern int addftnsrc;
static char **linestart;
LOCAL int ncont;
LOCAL char comstart[Table_size];
#define USC (unsigned char *)
static char anum_buf[Table_size];
#define isalnum_(x) anum_buf[x]
#define isalpha_(x) (anum_buf[x] == 1)
#define COMMENT_BUF_STORE 4088
typedef struct comment_buf {
struct comment_buf *next;
char *last;
char buf[COMMENT_BUF_STORE];
} comment_buf;
static comment_buf *cbfirst, *cbcur;
static char *cbinit, *cbnext, *cblast;
static void flush_comments Argdcl((void));
extern flag use_bs;
static char *lastfile = "??", *lastfile0 = "?";
static char fbuf[P1_FILENAME_MAX];
static long lastline;
static void putlineno(Void);
/* Comment buffering data
Comments are kept in a list until the statement before them has
been parsed. This list is implemented with the above comment_buf
structure and the pointers cbnext and cblast.
The comments are stored with terminating NULL, and no other
intervening space. The last few bytes of each block are likely to
remain unused.
*/
/* struct Inclfile holds the state information for each include file */
struct Inclfile
{
struct Inclfile *inclnext;
FILEP inclfp;
char *inclname;
int incllno;
char *incllinp;
int incllen;
int inclcode;
ftnint inclstno;
};
LOCAL struct Inclfile *inclp = NULL;
struct Keylist {
char *keyname;
int keyval;
char notinf66;
};
struct Punctlist {
char punchar;
int punval;
};
struct Fmtlist {
char fmtchar;
int fmtval;
};
struct Dotlist {
char *dotname;
int dotval;
};
LOCAL struct Keylist *keystart[26], *keyend[26];
/* KEYWORD AND SPECIAL CHARACTER TABLES
*/
static struct Punctlist puncts[ ] =
{
'(', SLPAR,
')', SRPAR,
'=', SEQUALS,
',', SCOMMA,
'+', SPLUS,
'-', SMINUS,
'*', SSTAR,
'/', SSLASH,
'$', SCURRENCY,
':', SCOLON,
'<', SLT,
'>', SGT,
0, 0 };
LOCAL struct Dotlist dots[ ] =
{
"and.", SAND,
"or.", SOR,
"not.", SNOT,
"true.", STRUE,
"false.", SFALSE,
"eq.", SEQ,
"ne.", SNE,
"lt.", SLT,
"le.", SLE,
"gt.", SGT,
"ge.", SGE,
"neqv.", SNEQV,
"eqv.", SEQV,
0, 0 };
LOCAL struct Keylist keys[ ] =
{
{ "assign", SASSIGN },
{ "automatic", SAUTOMATIC, YES },
{ "backspace", SBACKSPACE },
{ "blockdata", SBLOCK },
{ "byte", SBYTE },
{ "call", SCALL },
{ "character", SCHARACTER, YES },
{ "close", SCLOSE, YES },
{ "common", SCOMMON },
{ "complex", SCOMPLEX },
{ "continue", SCONTINUE },
{ "data", SDATA },
{ "dimension", SDIMENSION },
{ "doubleprecision", SDOUBLE },
{ "doublecomplex", SDCOMPLEX, YES },
{ "elseif", SELSEIF, YES },
{ "else", SELSE, YES },
{ "endfile", SENDFILE },
{ "endif", SENDIF, YES },
{ "enddo", SENDDO, YES },
{ "end", SEND },
{ "entry", SENTRY, YES },
{ "equivalence", SEQUIV },
{ "external", SEXTERNAL },
{ "format", SFORMAT },
{ "function", SFUNCTION },
{ "goto", SGOTO },
{ "implicit", SIMPLICIT, YES },
{ "include", SINCLUDE, YES },
{ "inquire", SINQUIRE, YES },
{ "intrinsic", SINTRINSIC, YES },
{ "integer", SINTEGER },
{ "logical", SLOGICAL },
{ "namelist", SNAMELIST, YES },
{ "none", SUNDEFINED, YES },
{ "open", SOPEN, YES },
{ "parameter", SPARAM, YES },
{ "pause", SPAUSE },
{ "print", SPRINT },
{ "program", SPROGRAM, YES },
{ "punch", SPUNCH, YES },
{ "read", SREAD },
{ "real", SREAL },
{ "return", SRETURN },
{ "rewind", SREWIND },
{ "save", SSAVE, YES },
{ "static", SSTATIC, YES },
{ "stop", SSTOP },
{ "subroutine", SSUBROUTINE },
{ "then", STHEN, YES },
{ "undefined", SUNDEFINED, YES },
{ "while", SWHILE, YES },
{ "write", SWRITE },
{ 0, 0 }
};
static void analyz Argdcl((void));
static void crunch Argdcl((void));
static int getcd Argdcl((char*, int));
static int getcds Argdcl((void));
static int getkwd Argdcl((void));
static int gettok Argdcl((void));
static void store_comment Argdcl((char*));
LOCAL char *stbuf[3];
int
#ifdef KR_headers
inilex(name)
char *name;
#else
inilex(char *name)
#endif
{
stbuf[0] = Alloc(3*P1_STMTBUFSIZE);
stbuf[1] = stbuf[0] + P1_STMTBUFSIZE;
stbuf[2] = stbuf[1] + P1_STMTBUFSIZE;
nincl = 0;
inclp = NULL;
doinclude(name);
lexstate = NEWSTMT;
return(NO);
}
/* throw away the rest of the current line */
void
flline(Void)
{
lexstate = RETEOS;
}
char *
#ifdef KR_headers
lexline(n)
int *n;
#else
lexline(int *n)
#endif
{
*n = (lastch - nextch) + 1;
return(nextch);
}
void
#ifdef KR_headers
doinclude(name)
char *name;
#else
doinclude(char *name)
#endif
{
FILEP fp;
struct Inclfile *t;
char *name0, *lastslash, *s, *s0, *temp;
int j, k;
chainp I;
extern chainp Iargs;
err_lineno = -1;
if(inclp)
{
inclp->incllno = thislin;
inclp->inclcode = code;
inclp->inclstno = nxtstno;
if(nextcd && (j = endcd - nextcd) > 0)
inclp->incllinp = copyn(inclp->incllen = j, nextcd);
else
inclp->incllinp = 0;
}
nextcd = NULL;
if(++nincl >= MAXINCLUDES)
Fatal("includes nested too deep");
if(name[0] == '\0')
fp = stdin;
else if(name[0] == '/' || inclp == NULL
#ifdef MSDOS
|| name[0] == '\\'
|| name[1] == ':'
#endif
)
fp = fopen(name, textread);
else {
lastslash = NULL;
s = s0 = inclp->inclname;
#ifdef MSDOS
if (s[1] == ':')
lastslash = s + 1;
#endif
for(; *s ; ++s)
if(*s == '/'
#ifdef MSDOS
|| *s == '\\'
#endif
)
lastslash = s;
name0 = name;
if(lastslash) {
k = lastslash - s0 + 1;
temp = Alloc(k + strlen(name) + 1);
strncpy(temp, s0, k);
strcpy(temp+k, name);
name = temp;
}
fp = fopen(name, textread);
if (!fp && (I = Iargs)) {
k = strlen(name0) + 2;
for(; I; I = I->nextp) {
j = strlen(s = I->datap);
name = Alloc(j + k);
strcpy(name, s);
switch(s[j-1]) {
case '/':
#ifdef MSDOS
case ':':
case '\\':
#endif
break;
default:
name[j++] = '/';
}
strcpy(name+j, name0);
if (fp = fopen(name, textread)) {
free(name0);
goto havefp;
}
free(name);
name = name0;
}
}
}
if (fp)
{
havefp:
t = inclp;
inclp = ALLOC(Inclfile);
inclp->inclnext = t;
prevlin = thislin = lineno = 0;
infname = inclp->inclname = name;
infile = inclp->inclfp = fp;
lastline = 0;
putlineno();
lastline = 0;
}
else
{
fprintf(diagfile, "Cannot open file %s\n", name);
done(1);
}
}
LOCAL int
popinclude(Void)
{
struct Inclfile *t;
register char *p;
register int k;
if(infile != stdin)
clf(&infile, infname, 1); /* Close the input file */
free(infname);
--nincl;
err_lineno = -1;
t = inclp->inclnext;
free( (charptr) inclp);
inclp = t;
if(inclp == NULL) {
infname = 0;
return(NO);
}
infile = inclp->inclfp;
infname = inclp->inclname;
lineno = prevlin = thislin = inclp->incllno;
code = inclp->inclcode;
stno = nxtstno = inclp->inclstno;
if(inclp->incllinp)
{
lastline = 0;
putlineno();
lastline = lineno;
endcd = nextcd = sbuf;
k = inclp->incllen;
p = inclp->incllinp;
while(--k >= 0)
*endcd++ = *p++;
free( (charptr) (inclp->incllinp) );
}
else
nextcd = NULL;
return(YES);
}
void
#ifdef KR_headers
p1_line_number(line_number)
long line_number;
#else
p1_line_number(long line_number)
#endif
{
if (lastfile != lastfile0) {
p1puts(P1_FILENAME, fbuf);
lastfile0 = lastfile;
}
fprintf(pass1_file, "%d: %ld\n", P1_SET_LINE, line_number);
}
static void
putlineno(Void)
{
extern int gflag;
register char *s0, *s1;
if (gflag) {
if (lastline)
p1_line_number(lastline);
lastline = firstline;
if (lastfile != infname)
if (lastfile = infname) {
strncpy(fbuf, lastfile, sizeof(fbuf));
fbuf[sizeof(fbuf)-1] = 0;
}
else
fbuf[0] = 0;
}
if (addftnsrc) {
if (laststb && *laststb) {
for(s1 = laststb; *s1; s1++) {
for(s0 = s1; *s1 != '\n'; s1++)
if (*s1 == '*' && s1[1] == '/')
*s1 = '+';
*s1 = 0;
p1puts(P1_FORTRAN, s0);
}
*laststb = 0; /* prevent trouble after EOF */
}
laststb = stb0;
}
}
int
yylex(Void)
{
static int tokno;
int retval;
switch(lexstate)
{
case NEWSTMT : /* need a new statement */
retval = getcds();
putlineno();
if(retval == STEOF) {
retval = SEOF;
break;
} /* if getcds() == STEOF */
crunch();
tokno = 0;
lexstate = FIRSTTOKEN;
yystno = stno;
stno = nxtstno;
toklen = 0;
retval = SLABEL;
break;
first:
case FIRSTTOKEN : /* first step on a statement */
analyz();
lexstate = OTHERTOKEN;
tokno = 1;
retval = stkey;
break;
case OTHERTOKEN : /* return next token */
if(nextch > lastch)
goto reteos;
++tokno;
if( (stkey==SLOGIF || stkey==SELSEIF) && parlev==0 && tokno>3)
goto first;
if(stkey==SASSIGN && tokno==3 && nextch<lastch &&
nextch[0]=='t' && nextch[1]=='o')
{
nextch+=2;
retval = STO;
break;
}
if (tokno == 2 && stkey == SDO) {
intonly = 1;
retval = gettok();
intonly = 0;
}
else
retval = gettok();
break;
reteos:
case RETEOS:
lexstate = NEWSTMT;
retval = SEOS;
break;
default:
fatali("impossible lexstate %d", lexstate);
break;
}
if (retval == SEOF)
flush_comments ();
return retval;
}
LOCAL void
contmax(Void)
{
lineno = thislin;
many("continuation lines", 'C', maxcontin);
}
/* Get Cards.
Returns STEOF or STINITIAL, never STCONTINUE. Any continuation cards get
merged into one long card (hence the size of the buffer named sbuf) */
LOCAL int
getcds(Void)
{
register char *p, *q;
flush_comments ();
top:
if(nextcd == NULL)
{
code = getcd( nextcd = sbuf, 1 );
stno = nxtstno;
prevlin = thislin;
}
if(code == STEOF)
if( popinclude() )
goto top;
else
return(STEOF);
if(code == STCONTINUE)
{
lineno = thislin;
nextcd = NULL;
goto top;
}
/* Get rid of unused space at the head of the buffer */
if(nextcd > sbuf)
{
q = nextcd;
p = sbuf;
while(q < endcd)
*p++ = *q++;
endcd = p;
}
/* Be aware that the input (i.e. the string at the address nextcd) is NOT
NULL-terminated */
/* This loop merges all continuations into one long statement, AND puts the next
card to be read at the end of the buffer (i.e. it stores the look-ahead card
when there's room) */
ncont = 0;
for(;;) {
nextcd = endcd;
if (ncont >= maxcont || nextcd+66 > send)
contmax();
linestart[ncont++] = nextcd;
if ((code = getcd(nextcd,0)) != STCONTINUE)
break;
if (ncont == 20 && noextflag) {
lineno = thislin;
errext("more than 19 continuation lines");
}
}
nextch = sbuf;
lastch = nextcd - 1;
lineno = prevlin;
prevlin = thislin;
if (infname2) {
free(infname);
infname = infname2;
if (inclp)
inclp->inclname = infname;
}
infname2 = infname1;
infname1 = 0;
return(STINITIAL);
}
static void
#ifdef KR_headers
bang(a, b, c, d, e)
char *a;
char *b;
char *c;
register char *d;
register char *e;
#else
bang(char *a, char *b, char *c, register char *d, register char *e)
#endif
/* save ! comments */
{
char buf[COMMENT_BUFFER_SIZE + 1];
register char *p, *pe;
p = buf;
pe = buf + COMMENT_BUFFER_SIZE;
*pe = 0;
while(a < b)
if (!(*p++ = *a++))
p[-1] = 0;
if (b < c)
*p++ = '\t';
while(d < e) {
if (!(*p++ = *d++))
p[-1] = ' ';
if (p == pe) {
store_comment(buf);
p = buf;
}
}
if (p > buf) {
while(--p >= buf && *p == ' ');
p[1] = 0;
store_comment(buf);
}
}
/* getcd - Get next input card
This function reads the next input card from global file pointer infile.
It assumes that b points to currently empty storage somewhere in sbuf */
LOCAL int
#ifdef KR_headers
getcd(b, nocont)
register char *b;
int nocont;
#else
getcd(register char *b, int nocont)
#endif
{
register int c;
register char *p, *bend;
int speclin; /* Special line - true when the line is allowed
to have more than 66 characters (e.g. the
"&" shorthand for continuation, use of a "\t"
to skip part of the label columns) */
static char a[6]; /* Statement label buffer */
static char *aend = a+6;
static char *stb, *stbend;
static int nst;
char *atend, *endcd0;
extern int warn72;
char buf72[24];
int amp, i;
char storage[COMMENT_BUFFER_SIZE + 1];
char *pointer;
long L;
top:
endcd = b;
bend = b+66;
amp = speclin = NO;
atend = aend;
/* Handle the continuation shorthand of "&" in the first column, which stands
for " x" */
if( (c = getc(infile)) == '&')
{
a[0] = c;
a[1] = 0;
a[5] = 'x';
amp = speclin = YES;
bend = send;
p = aend;
}
/* Handle the Comment cards (a 'C', 'c', '*', or '!' in the first column). */
else if(comstart[c & (Table_size-1)])
{
if (feof (infile)
#ifdef EOF_CHAR
|| c == EOF_CHAR
#endif
)
return STEOF;
if (c == '#') {
*endcd++ = c;
while((c = getc(infile)) != '\n')
if (c == EOF)
return STEOF;
else if (endcd < shend)
*endcd++ = c;
++thislin;
*endcd = 0;
if (b[1] == ' ')
p = b + 2;
else if (!strncmp(b,"#line ",6))
p = b + 6;
else {
bad_cpp:
lineno = thislin;
errstr("Bad # line: \"%s\"", b);
goto top;
}
if (*p < '1' || *p > '9')
goto bad_cpp;
L = *p - '0';
while((c = *++p) >= '0' && c <= '9')
L = 10*L + c - '0';
while(c == ' ')
c = *++p;
if (!c) {
/* accept "# 1234" */
thislin = L - 1;
goto top;
}
if (c != '"')
goto bad_cpp;
bend = p;
while(*++p != '"')
if (!*p)
goto bad_cpp;
*p = 0;
i = p - bend++;
thislin = L - 1;
if (!infname1 || strcmp(infname1, bend)) {
if (infname1)
free(infname1);
if (infname && !strcmp(infname, bend)) {
infname1 = 0;
goto top;
}
lastfile = 0;
infname1 = Alloc(i);
strcpy(infname1, bend);
if (!infname) {
infname = infname1;
infname1 = 0;
}
}
goto top;
}
storage[COMMENT_BUFFER_SIZE] = c = '\0';
pointer = storage;
while( !feof (infile) && (*pointer++ = c = getc(infile)) != '\n') {
/* Handle obscure end of file conditions on many machines */
if (feof (infile) && (c == '\377' || c == EOF)) {
pointer--;
break;
} /* if (feof (infile)) */
if (c == '\0')
*(pointer - 1) = ' ';
if (pointer == &storage[COMMENT_BUFFER_SIZE]) {
store_comment (storage);
pointer = storage;
} /* if (pointer == BUFFER_SIZE) */
} /* while */
if (pointer > storage) {
if (c == '\n')
/* Get rid of the newline */
pointer[-1] = 0;
else
*pointer = 0;
store_comment (storage);
} /* if */
if (feof (infile))
if (c != '\n') /* To allow the line index to
increment correctly */
return STEOF;
++thislin;
goto top;
}
else if(c != EOF)
{
/* Load buffer a with the statement label */
/* a tab in columns 1-6 skips to column 7 */
ungetc(c, infile);
for(p=a; p<aend && (c=getc(infile)) != '\n' && c!=EOF; )
if(c == '\t')
/* The tab character translates into blank characters in the statement label */
{
atend = p;
while(p < aend)
*p++ = BLANK;
speclin = YES;
bend = send;
}
else
*p++ = c;
}
/* By now we've read either a continuation character or the statement label
field */
if(c == EOF)
return(STEOF);
/* The next 'if' block handles lines that have fewer than 7 characters */
if(c == '\n')
{
while(p < aend)
*p++ = BLANK;
/* Blank out the buffer on lines which are not longer than 66 characters */
endcd0 = endcd;
if( ! speclin )
while(endcd < bend)
*endcd++ = BLANK;
}
else { /* read body of line */
if (warn72 & 2) {
speclin = YES;
bend = send;
}
while( endcd<bend && (c=getc(infile)) != '\n' && c!=EOF )
*endcd++ = c;
if(c == EOF)
return(STEOF);
/* Drop any extra characters on the input card; this usually means those after
column 72 */
if(c != '\n')
{
i = 0;
while( (c=getc(infile)) != '\n' && c != EOF)
if (i < 23 && c != '\r')
buf72[i++] = c;
if (warn72 && i && !speclin) {
buf72[i] = 0;
if (i >= 23)
strcpy(buf72+20, "...");
lineno = thislin + 1;
errstr("text after column 72: %s", buf72);
}
if(c == EOF)
return(STEOF);
}
endcd0 = endcd;
if( ! speclin )
while(endcd < bend)
*endcd++ = BLANK;
}
/* The flow of control usually gets to this line (unless an earlier RETURN has
been taken) */
++thislin;
/* Fortran 77 specifies that a 0 in column 6 */
/* does not signify continuation */
if( !isspace(a[5]) && a[5]!='0') {
if (!amp)
for(p = a; p < aend;)
if (*p++ == '!' && p != aend)
goto initcheck;
if (addftnsrc && stb) {
if (stbend > stb + 7) { /* otherwise forget col 1-6 */
/* kludge around funny p1gets behavior */
*stb++ = '$';
if (amp)
*stb++ = '&';
else
for(p = a; p < atend;)
*stb++ = *p++;
}
if (endcd0 - b > stbend - stb) {
if (stb > stbend)
stb = stbend;
endcd0 = b + (stbend - stb);
}
for(p = b; p < endcd0;)
*stb++ = *p++;
*stb++ = '\n';
*stb = 0;
}
if (nocont) {
lineno = thislin;
errstr("illegal continuation card (starts \"%.6s\")",a);
}
else if (!amp && strncmp(a," ",5)) {
lineno = thislin;
errstr("labeled continuation line (starts \"%.6s\")",a);
}
return(STCONTINUE);
}
initcheck:
for(p=a; p<atend; ++p)
if( !isspace(*p) ) {
if (*p++ != '!')
goto initline;
bang(p, atend, aend, b, endcd);
goto top;
}
for(p = b ; p<endcd ; ++p)
if( !isspace(*p) ) {
if (*p++ != '!')
goto initline;
bang(a, a, a, p, endcd);
goto top;
}