583 lines
13 KiB
C
583 lines
13 KiB
C
/****************************************************************
|
|
Copyright (C) Lucent Technologies 1997
|
|
All Rights Reserved
|
|
|
|
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 name Lucent Technologies or any of
|
|
its entities not be used in advertising or publicity pertaining
|
|
to distribution of the software without specific, written prior
|
|
permission.
|
|
|
|
LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
|
|
IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES 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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include "awk.h"
|
|
#include "awkgram.h"
|
|
|
|
extern YYSTYPE yylval;
|
|
extern int infunc;
|
|
|
|
int lineno = 1;
|
|
int bracecnt = 0;
|
|
int brackcnt = 0;
|
|
int parencnt = 0;
|
|
|
|
typedef struct Keyword {
|
|
const char *word;
|
|
int sub;
|
|
int type;
|
|
} Keyword;
|
|
|
|
Keyword keywords[] ={ /* keep sorted: binary searched */
|
|
{ "BEGIN", XBEGIN, XBEGIN },
|
|
{ "END", XEND, XEND },
|
|
{ "NF", VARNF, VARNF },
|
|
{ "atan2", FATAN, BLTIN },
|
|
{ "break", BREAK, BREAK },
|
|
{ "close", CLOSE, CLOSE },
|
|
{ "continue", CONTINUE, CONTINUE },
|
|
{ "cos", FCOS, BLTIN },
|
|
{ "delete", DELETE, DELETE },
|
|
{ "do", DO, DO },
|
|
{ "else", ELSE, ELSE },
|
|
{ "exit", EXIT, EXIT },
|
|
{ "exp", FEXP, BLTIN },
|
|
{ "fflush", FFLUSH, BLTIN },
|
|
{ "for", FOR, FOR },
|
|
{ "func", FUNC, FUNC },
|
|
{ "function", FUNC, FUNC },
|
|
{ "getline", GETLINE, GETLINE },
|
|
{ "gsub", GSUB, GSUB },
|
|
{ "if", IF, IF },
|
|
{ "in", IN, IN },
|
|
{ "index", INDEX, INDEX },
|
|
{ "int", FINT, BLTIN },
|
|
{ "length", FLENGTH, BLTIN },
|
|
{ "log", FLOG, BLTIN },
|
|
{ "match", MATCHFCN, MATCHFCN },
|
|
{ "next", NEXT, NEXT },
|
|
{ "nextfile", NEXTFILE, NEXTFILE },
|
|
{ "print", PRINT, PRINT },
|
|
{ "printf", PRINTF, PRINTF },
|
|
{ "rand", FRAND, BLTIN },
|
|
{ "return", RETURN, RETURN },
|
|
{ "sin", FSIN, BLTIN },
|
|
{ "split", SPLIT, SPLIT },
|
|
{ "sprintf", SPRINTF, SPRINTF },
|
|
{ "sqrt", FSQRT, BLTIN },
|
|
{ "srand", FSRAND, BLTIN },
|
|
{ "sub", SUB, SUB },
|
|
{ "substr", SUBSTR, SUBSTR },
|
|
{ "system", FSYSTEM, BLTIN },
|
|
{ "tolower", FTOLOWER, BLTIN },
|
|
{ "toupper", FTOUPPER, BLTIN },
|
|
{ "while", WHILE, WHILE },
|
|
};
|
|
|
|
#define RET(x) { if(dbg)printf("lex %s\n", tokname(x)); return(x); }
|
|
|
|
int peek(void)
|
|
{
|
|
int c = input();
|
|
unput(c);
|
|
return c;
|
|
}
|
|
|
|
int gettok(char **pbuf, int *psz) /* get next input token */
|
|
{
|
|
int c, retc;
|
|
char *buf = *pbuf;
|
|
int sz = *psz;
|
|
char *bp = buf;
|
|
|
|
c = input();
|
|
if (c == 0)
|
|
return 0;
|
|
buf[0] = c;
|
|
buf[1] = 0;
|
|
if (!isalnum(c) && c != '.' && c != '_')
|
|
return c;
|
|
|
|
*bp++ = c;
|
|
if (isalpha(c) || c == '_') { /* it's a varname */
|
|
for ( ; (c = input()) != 0; ) {
|
|
if (bp-buf >= sz)
|
|
if (!adjbuf(&buf, &sz, bp-buf+2, 100, &bp, "gettok"))
|
|
FATAL( "out of space for name %.10s...", buf );
|
|
if (isalnum(c) || c == '_')
|
|
*bp++ = c;
|
|
else {
|
|
*bp = 0;
|
|
unput(c);
|
|
break;
|
|
}
|
|
}
|
|
*bp = 0;
|
|
retc = 'a'; /* alphanumeric */
|
|
} else { /* maybe it's a number, but could be . */
|
|
char *rem;
|
|
/* read input until can't be a number */
|
|
for ( ; (c = input()) != 0; ) {
|
|
if (bp-buf >= sz)
|
|
if (!adjbuf(&buf, &sz, bp-buf+2, 100, &bp, "gettok"))
|
|
FATAL( "out of space for number %.10s...", buf );
|
|
if (isdigit(c) || c == 'e' || c == 'E'
|
|
|| c == '.' || c == '+' || c == '-')
|
|
*bp++ = c;
|
|
else {
|
|
unput(c);
|
|
break;
|
|
}
|
|
}
|
|
*bp = 0;
|
|
strtod(buf, &rem); /* parse the number */
|
|
if (rem == buf) { /* it wasn't a valid number at all */
|
|
buf[1] = 0; /* return one character as token */
|
|
retc = buf[0]; /* character is its own type */
|
|
unputstr(rem+1); /* put rest back for later */
|
|
} else { /* some prefix was a number */
|
|
unputstr(rem); /* put rest back for later */
|
|
rem[0] = 0; /* truncate buf after number part */
|
|
retc = '0'; /* type is number */
|
|
}
|
|
}
|
|
*pbuf = buf;
|
|
*psz = sz;
|
|
return retc;
|
|
}
|
|
|
|
int word(char *);
|
|
int string(void);
|
|
int regexpr(void);
|
|
int sc = 0; /* 1 => return a } right now */
|
|
int reg = 0; /* 1 => return a REGEXPR now */
|
|
|
|
int yylex(void)
|
|
{
|
|
int c;
|
|
static char *buf = 0;
|
|
static int bufsize = 5; /* BUG: setting this small causes core dump! */
|
|
|
|
if (buf == 0 && (buf = (char *) malloc(bufsize)) == NULL)
|
|
FATAL( "out of space in yylex" );
|
|
if (sc) {
|
|
sc = 0;
|
|
RET('}');
|
|
}
|
|
if (reg) {
|
|
reg = 0;
|
|
return regexpr();
|
|
}
|
|
for (;;) {
|
|
c = gettok(&buf, &bufsize);
|
|
if (c == 0)
|
|
return 0;
|
|
if (isalpha(c) || c == '_')
|
|
return word(buf);
|
|
if (isdigit(c)) {
|
|
yylval.cp = setsymtab(buf, tostring(buf), atof(buf), CON|NUM, symtab);
|
|
/* should this also have STR set? */
|
|
RET(NUMBER);
|
|
}
|
|
|
|
yylval.i = c;
|
|
switch (c) {
|
|
case '\n': /* {EOL} */
|
|
RET(NL);
|
|
case '\r': /* assume \n is coming */
|
|
case ' ': /* {WS}+ */
|
|
case '\t':
|
|
break;
|
|
case '#': /* #.* strip comments */
|
|
while ((c = input()) != '\n' && c != 0)
|
|
;
|
|
unput(c);
|
|
break;
|
|
case ';':
|
|
RET(';');
|
|
case '\\':
|
|
if (peek() == '\n') {
|
|
input();
|
|
} else if (peek() == '\r') {
|
|
input(); input(); /* \n */
|
|
lineno++;
|
|
} else {
|
|
RET(c);
|
|
}
|
|
break;
|
|
case '&':
|
|
if (peek() == '&') {
|
|
input(); RET(AND);
|
|
} else
|
|
RET('&');
|
|
case '|':
|
|
if (peek() == '|') {
|
|
input(); RET(BOR);
|
|
} else
|
|
RET('|');
|
|
case '!':
|
|
if (peek() == '=') {
|
|
input(); yylval.i = NE; RET(NE);
|
|
} else if (peek() == '~') {
|
|
input(); yylval.i = NOTMATCH; RET(MATCHOP);
|
|
} else
|
|
RET(NOT);
|
|
case '~':
|
|
yylval.i = MATCH;
|
|
RET(MATCHOP);
|
|
case '<':
|
|
if (peek() == '=') {
|
|
input(); yylval.i = LE; RET(LE);
|
|
} else {
|
|
yylval.i = LT; RET(LT);
|
|
}
|
|
case '=':
|
|
if (peek() == '=') {
|
|
input(); yylval.i = EQ; RET(EQ);
|
|
} else {
|
|
yylval.i = ASSIGN; RET(ASGNOP);
|
|
}
|
|
case '>':
|
|
if (peek() == '=') {
|
|
input(); yylval.i = GE; RET(GE);
|
|
} else if (peek() == '>') {
|
|
input(); yylval.i = APPEND; RET(APPEND);
|
|
} else {
|
|
yylval.i = GT; RET(GT);
|
|
}
|
|
case '+':
|
|
if (peek() == '+') {
|
|
input(); yylval.i = INCR; RET(INCR);
|
|
} else if (peek() == '=') {
|
|
input(); yylval.i = ADDEQ; RET(ASGNOP);
|
|
} else
|
|
RET('+');
|
|
case '-':
|
|
if (peek() == '-') {
|
|
input(); yylval.i = DECR; RET(DECR);
|
|
} else if (peek() == '=') {
|
|
input(); yylval.i = SUBEQ; RET(ASGNOP);
|
|
} else
|
|
RET('-');
|
|
case '*':
|
|
if (peek() == '=') { /* *= */
|
|
input(); yylval.i = MULTEQ; RET(ASGNOP);
|
|
} else if (peek() == '*') { /* ** or **= */
|
|
input(); /* eat 2nd * */
|
|
if (peek() == '=') {
|
|
input(); yylval.i = POWEQ; RET(ASGNOP);
|
|
} else {
|
|
RET(POWER);
|
|
}
|
|
} else
|
|
RET('*');
|
|
case '/':
|
|
RET('/');
|
|
case '%':
|
|
if (peek() == '=') {
|
|
input(); yylval.i = MODEQ; RET(ASGNOP);
|
|
} else
|
|
RET('%');
|
|
case '^':
|
|
if (peek() == '=') {
|
|
input(); yylval.i = POWEQ; RET(ASGNOP);
|
|
} else
|
|
RET(POWER);
|
|
|
|
case '$':
|
|
/* BUG: awkward, if not wrong */
|
|
c = gettok(&buf, &bufsize);
|
|
if (isalpha(c)) {
|
|
if (strcmp(buf, "NF") == 0) { /* very special */
|
|
unputstr("(NF)");
|
|
RET(INDIRECT);
|
|
}
|
|
c = peek();
|
|
if (c == '(' || c == '[' || (infunc && isarg(buf) >= 0)) {
|
|
unputstr(buf);
|
|
RET(INDIRECT);
|
|
}
|
|
yylval.cp = setsymtab(buf, "", 0.0, STR|NUM, symtab);
|
|
RET(IVAR);
|
|
} else if (c == 0) { /* */
|
|
SYNTAX( "unexpected end of input after $" );
|
|
RET(';');
|
|
} else {
|
|
unputstr(buf);
|
|
RET(INDIRECT);
|
|
}
|
|
|
|
case '}':
|
|
if (--bracecnt < 0)
|
|
SYNTAX( "extra }" );
|
|
sc = 1;
|
|
RET(';');
|
|
case ']':
|
|
if (--brackcnt < 0)
|
|
SYNTAX( "extra ]" );
|
|
RET(']');
|
|
case ')':
|
|
if (--parencnt < 0)
|
|
SYNTAX( "extra )" );
|
|
RET(')');
|
|
case '{':
|
|
bracecnt++;
|
|
RET('{');
|
|
case '[':
|
|
brackcnt++;
|
|
RET('[');
|
|
case '(':
|
|
parencnt++;
|
|
RET('(');
|
|
|
|
case '"':
|
|
return string(); /* BUG: should be like tran.c ? */
|
|
|
|
default:
|
|
RET(c);
|
|
}
|
|
}
|
|
}
|
|
|
|
int string(void)
|
|
{
|
|
int c, n;
|
|
char *s, *bp;
|
|
static char *buf = 0;
|
|
static int bufsz = 500;
|
|
|
|
if (buf == 0 && (buf = (char *) malloc(bufsz)) == NULL)
|
|
FATAL("out of space for strings");
|
|
for (bp = buf; (c = input()) != '"'; ) {
|
|
if (!adjbuf(&buf, &bufsz, bp-buf+2, 500, &bp, "string"))
|
|
FATAL("out of space for string %.10s...", buf);
|
|
switch (c) {
|
|
case '\n':
|
|
case '\r':
|
|
case 0:
|
|
SYNTAX( "non-terminated string %.10s...", buf );
|
|
lineno++;
|
|
if (c == 0) /* hopeless */
|
|
FATAL( "giving up" );
|
|
break;
|
|
case '\\':
|
|
c = input();
|
|
switch (c) {
|
|
case '"': *bp++ = '"'; break;
|
|
case 'n': *bp++ = '\n'; break;
|
|
case 't': *bp++ = '\t'; break;
|
|
case 'f': *bp++ = '\f'; break;
|
|
case 'r': *bp++ = '\r'; break;
|
|
case 'b': *bp++ = '\b'; break;
|
|
case 'v': *bp++ = '\v'; break;
|
|
case 'a': *bp++ = '\007'; break;
|
|
case '\\': *bp++ = '\\'; break;
|
|
|
|
case '0': case '1': case '2': /* octal: \d \dd \ddd */
|
|
case '3': case '4': case '5': case '6': case '7':
|
|
n = c - '0';
|
|
if ((c = peek()) >= '0' && c < '8') {
|
|
n = 8 * n + input() - '0';
|
|
if ((c = peek()) >= '0' && c < '8')
|
|
n = 8 * n + input() - '0';
|
|
}
|
|
*bp++ = n;
|
|
break;
|
|
|
|
case 'x': /* hex \x0-9a-fA-F + */
|
|
{ char xbuf[100], *px;
|
|
for (px = xbuf; (c = input()) != 0 && px-xbuf < 100-2; ) {
|
|
if (isdigit(c)
|
|
|| (c >= 'a' && c <= 'f')
|
|
|| (c >= 'A' && c <= 'F'))
|
|
*px++ = c;
|
|
else
|
|
break;
|
|
}
|
|
*px = 0;
|
|
unput(c);
|
|
sscanf(xbuf, "%x", &n);
|
|
*bp++ = n;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
*bp++ = c;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
*bp++ = c;
|
|
break;
|
|
}
|
|
}
|
|
*bp = 0;
|
|
s = tostring(buf);
|
|
*bp++ = ' '; *bp++ = 0;
|
|
yylval.cp = setsymtab(buf, s, 0.0, CON|STR|DONTFREE, symtab);
|
|
RET(STRING);
|
|
}
|
|
|
|
|
|
int binsearch(const char *w, const Keyword *kp, int n)
|
|
{
|
|
int cond, low, mid, high;
|
|
|
|
low = 0;
|
|
high = n - 1;
|
|
while (low <= high) {
|
|
mid = (low + high) / 2;
|
|
if ((cond = strcmp(w, kp[mid].word)) < 0)
|
|
high = mid - 1;
|
|
else if (cond > 0)
|
|
low = mid + 1;
|
|
else
|
|
return mid;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int word(char *w)
|
|
{
|
|
Keyword *kp;
|
|
int c, n;
|
|
|
|
n = binsearch(w, keywords, sizeof(keywords)/sizeof(keywords[0]));
|
|
/* BUG: this ought to be inside the if; in theory could fault (daniel barrett) */
|
|
kp = keywords + n;
|
|
if (n != -1) { /* found in table */
|
|
yylval.i = kp->sub;
|
|
switch (kp->type) { /* special handling */
|
|
case BLTIN:
|
|
if (kp->sub == FSYSTEM && safe)
|
|
SYNTAX( "system is unsafe" );
|
|
RET(kp->type);
|
|
case FUNC:
|
|
if (infunc)
|
|
SYNTAX( "illegal nested function" );
|
|
RET(kp->type);
|
|
case RETURN:
|
|
if (!infunc)
|
|
SYNTAX( "return not in function" );
|
|
RET(kp->type);
|
|
case VARNF:
|
|
yylval.cp = setsymtab("NF", "", 0.0, NUM, symtab);
|
|
RET(VARNF);
|
|
default:
|
|
RET(kp->type);
|
|
}
|
|
}
|
|
c = peek(); /* look for '(' */
|
|
if (c != '(' && infunc && (n=isarg(w)) >= 0) {
|
|
yylval.i = n;
|
|
RET(ARG);
|
|
} else {
|
|
yylval.cp = setsymtab(w, "", 0.0, STR|NUM|DONTFREE, symtab);
|
|
if (c == '(') {
|
|
RET(CALL);
|
|
} else {
|
|
RET(VAR);
|
|
}
|
|
}
|
|
}
|
|
|
|
void startreg(void) /* next call to yylex will return a regular expression */
|
|
{
|
|
reg = 1;
|
|
}
|
|
|
|
int regexpr(void)
|
|
{
|
|
int c;
|
|
static char *buf = 0;
|
|
static int bufsz = 500;
|
|
char *bp;
|
|
|
|
if (buf == 0 && (buf = (char *) malloc(bufsz)) == NULL)
|
|
FATAL("out of space for rex expr");
|
|
bp = buf;
|
|
for ( ; (c = input()) != '/' && c != 0; ) {
|
|
if (!adjbuf(&buf, &bufsz, bp-buf+3, 500, &bp, "regexpr"))
|
|
FATAL("out of space for reg expr %.10s...", buf);
|
|
if (c == '\n') {
|
|
SYNTAX( "newline in regular expression %.10s...", buf );
|
|
unput('\n');
|
|
break;
|
|
} else if (c == '\\') {
|
|
*bp++ = '\\';
|
|
*bp++ = input();
|
|
} else {
|
|
*bp++ = c;
|
|
}
|
|
}
|
|
*bp = 0;
|
|
if (c == 0)
|
|
SYNTAX("non-terminated regular expression %.10s...", buf);
|
|
yylval.s = tostring(buf);
|
|
unput('/');
|
|
RET(REGEXPR);
|
|
}
|
|
|
|
/* low-level lexical stuff, sort of inherited from lex */
|
|
|
|
char ebuf[300];
|
|
char *ep = ebuf;
|
|
char yysbuf[100]; /* pushback buffer */
|
|
char *yysptr = yysbuf;
|
|
FILE *yyin = 0;
|
|
|
|
int input(void) /* get next lexical input character */
|
|
{
|
|
int c;
|
|
extern char *lexprog;
|
|
|
|
if (yysptr > yysbuf)
|
|
c = (uschar)*--yysptr;
|
|
else if (lexprog != NULL) { /* awk '...' */
|
|
if ((c = (uschar)*lexprog) != 0)
|
|
lexprog++;
|
|
} else /* awk -f ... */
|
|
c = pgetc();
|
|
if (c == '\n')
|
|
lineno++;
|
|
else if (c == EOF)
|
|
c = 0;
|
|
if (ep >= ebuf + sizeof ebuf)
|
|
ep = ebuf;
|
|
return *ep++ = c;
|
|
}
|
|
|
|
void unput(int c) /* put lexical character back on input */
|
|
{
|
|
if (c == '\n')
|
|
lineno--;
|
|
if (yysptr >= yysbuf + sizeof(yysbuf))
|
|
FATAL("pushed back too much: %.20s...", yysbuf);
|
|
*yysptr++ = c;
|
|
if (--ep < ebuf)
|
|
ep = ebuf + sizeof(ebuf) - 1;
|
|
}
|
|
|
|
void unputstr(const char *s) /* put a string back on input */
|
|
{
|
|
int i;
|
|
|
|
for (i = strlen(s)-1; i >= 0; i--)
|
|
unput(s[i]);
|
|
}
|