Show lex.c syntax highlighted
#include "c.h"
#include <float.h>
#include <errno.h>
#define MAXTOKEN 32
enum { BLANK=01, NEWLINE=02, LETTER=04,
DIGIT=010, HEX=020, OTHER=040 };
static unsigned char map[256] = { /* 000 nul */ 0,
/* 001 soh */ 0,
/* 002 stx */ 0,
/* 003 etx */ 0,
/* 004 eot */ 0,
/* 005 enq */ 0,
/* 006 ack */ 0,
/* 007 bel */ 0,
/* 010 bs */ 0,
/* 011 ht */ BLANK,
/* 012 nl */ NEWLINE,
/* 013 vt */ BLANK,
/* 014 ff */ BLANK,
/* 015 cr */ 0,
/* 016 so */ 0,
/* 017 si */ 0,
/* 020 dle */ 0,
/* 021 dc1 */ 0,
/* 022 dc2 */ 0,
/* 023 dc3 */ 0,
/* 024 dc4 */ 0,
/* 025 nak */ 0,
/* 026 syn */ 0,
/* 027 etb */ 0,
/* 030 can */ 0,
/* 031 em */ 0,
/* 032 sub */ 0,
/* 033 esc */ 0,
/* 034 fs */ 0,
/* 035 gs */ 0,
/* 036 rs */ 0,
/* 037 us */ 0,
/* 040 sp */ BLANK,
/* 041 ! */ OTHER,
/* 042 " */ OTHER,
/* 043 # */ OTHER,
/* 044 $ */ 0,
/* 045 % */ OTHER,
/* 046 & */ OTHER,
/* 047 ' */ OTHER,
/* 050 ( */ OTHER,
/* 051 ) */ OTHER,
/* 052 * */ OTHER,
/* 053 + */ OTHER,
/* 054 , */ OTHER,
/* 055 - */ OTHER,
/* 056 . */ OTHER,
/* 057 / */ OTHER,
/* 060 0 */ DIGIT,
/* 061 1 */ DIGIT,
/* 062 2 */ DIGIT,
/* 063 3 */ DIGIT,
/* 064 4 */ DIGIT,
/* 065 5 */ DIGIT,
/* 066 6 */ DIGIT,
/* 067 7 */ DIGIT,
/* 070 8 */ DIGIT,
/* 071 9 */ DIGIT,
/* 072 : */ OTHER,
/* 073 ; */ OTHER,
/* 074 < */ OTHER,
/* 075 = */ OTHER,
/* 076 > */ OTHER,
/* 077 ? */ OTHER,
/* 100 @ */ 0,
/* 101 A */ LETTER|HEX,
/* 102 B */ LETTER|HEX,
/* 103 C */ LETTER|HEX,
/* 104 D */ LETTER|HEX,
/* 105 E */ LETTER|HEX,
/* 106 F */ LETTER|HEX,
/* 107 G */ LETTER,
/* 110 H */ LETTER,
/* 111 I */ LETTER,
/* 112 J */ LETTER,
/* 113 K */ LETTER,
/* 114 L */ LETTER,
/* 115 M */ LETTER,
/* 116 N */ LETTER,
/* 117 O */ LETTER,
/* 120 P */ LETTER,
/* 121 Q */ LETTER,
/* 122 R */ LETTER,
/* 123 S */ LETTER,
/* 124 T */ LETTER,
/* 125 U */ LETTER,
/* 126 V */ LETTER,
/* 127 W */ LETTER,
/* 130 X */ LETTER,
/* 131 Y */ LETTER,
/* 132 Z */ LETTER,
/* 133 [ */ OTHER,
/* 134 \ */ OTHER,
/* 135 ] */ OTHER,
/* 136 ^ */ OTHER,
/* 137 _ */ LETTER,
/* 140 ` */ 0,
/* 141 a */ LETTER|HEX,
/* 142 b */ LETTER|HEX,
/* 143 c */ LETTER|HEX,
/* 144 d */ LETTER|HEX,
/* 145 e */ LETTER|HEX,
/* 146 f */ LETTER|HEX,
/* 147 g */ LETTER,
/* 150 h */ LETTER,
/* 151 i */ LETTER,
/* 152 j */ LETTER,
/* 153 k */ LETTER,
/* 154 l */ LETTER,
/* 155 m */ LETTER,
/* 156 n */ LETTER,
/* 157 o */ LETTER,
/* 160 p */ LETTER,
/* 161 q */ LETTER,
/* 162 r */ LETTER,
/* 163 s */ LETTER,
/* 164 t */ LETTER,
/* 165 u */ LETTER,
/* 166 v */ LETTER,
/* 167 w */ LETTER,
/* 170 x */ LETTER,
/* 171 y */ LETTER,
/* 172 z */ LETTER,
/* 173 { */ OTHER,
/* 174 | */ OTHER,
/* 175 } */ OTHER,
/* 176 ~ */ OTHER, };
static struct symbol tval;
static char cbuf[BUFSIZE+1];
static unsigned int wcbuf[BUFSIZE+1];
Coordinate src; /* current source coordinate */
int t;
char *token; /* current token */
Symbol tsym; /* symbol table entry for current token */
static void *cput(int c, void *cl);
static void *wcput(int c, void *cl);
static void *scon(int q, void *put(int c, void *cl), void *cl);
static int backslash(int q);
static Symbol fcon(void);
static Symbol icon(unsigned long, int, int);
static void ppnumber(char *);
int gettok(void) {
for (;;) {
register unsigned char *rcp = cp;
while (map[*rcp]&BLANK)
rcp++;
if (limit - rcp < MAXTOKEN) {
cp = rcp;
fillbuf();
rcp = cp;
}
src.file = file;
src.x = (char *)rcp - line;
src.y = lineno;
cp = rcp + 1;
switch (*rcp++) {
case '/': if (*rcp == '*') {
int c = 0;
for (rcp++; *rcp != '/' || c != '*'; )
if (map[*rcp]&NEWLINE) {
if (rcp < limit)
c = *rcp;
cp = rcp + 1;
nextline();
rcp = cp;
if (rcp == limit)
break;
} else
c = *rcp++;
if (rcp < limit)
rcp++;
else
error("unclosed comment\n");
cp = rcp;
continue;
}
return '/';
case '<':
if (*rcp == '=') return cp++, LEQ;
if (*rcp == '<') return cp++, LSHIFT;
return '<';
case '>':
if (*rcp == '=') return cp++, GEQ;
if (*rcp == '>') return cp++, RSHIFT;
return '>';
case '-':
if (*rcp == '>') return cp++, DEREF;
if (*rcp == '-') return cp++, DECR;
return '-';
case '=': return *rcp == '=' ? cp++, EQL : '=';
case '!': return *rcp == '=' ? cp++, NEQ : '!';
case '|': return *rcp == '|' ? cp++, OROR : '|';
case '&': return *rcp == '&' ? cp++, ANDAND : '&';
case '+': return *rcp == '+' ? cp++, INCR : '+';
case ';': case ',': case ':':
case '*': case '~': case '%': case '^': case '?':
case '[': case ']': case '{': case '}': case '(': case ')':
return rcp[-1];
case '\n': case '\v': case '\r': case '\f':
nextline();
if (cp == limit) {
tsym = NULL;
return EOI;
}
continue;
case 'i':
if (rcp[0] == 'f'
&& !(map[rcp[1]]&(DIGIT|LETTER))) {
cp = rcp + 1;
return IF;
}
if (rcp[0] == 'n'
&& rcp[1] == 't'
&& !(map[rcp[2]]&(DIGIT|LETTER))) {
cp = rcp + 2;
tsym = inttype->u.sym;
return INT;
}
goto id;
case 'h': case 'j': case 'k': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'x': case 'y': case 'z':
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
case 'G': case 'H': case 'I': case 'J': case 'K':
case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
case 'Y': case 'Z':
id:
if (limit - rcp < MAXLINE) {
cp = rcp - 1;
fillbuf();
rcp = ++cp;
}
assert(cp == rcp);
token = (char *)rcp - 1;
while (map[*rcp]&(DIGIT|LETTER))
rcp++;
token = stringn(token, (char *)rcp - token);
tsym = lookup(token, identifiers);
cp = rcp;
return ID;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9': {
unsigned long n = 0;
if (limit - rcp < MAXLINE) {
cp = rcp - 1;
fillbuf();
rcp = ++cp;
}
assert(cp == rcp);
token = (char *)rcp - 1;
if (*token == '0' && (*rcp == 'x' || *rcp == 'X')) {
int d, overflow = 0;
while (*++rcp) {
if (map[*rcp]&DIGIT)
d = *rcp - '0';
else if (*rcp >= 'a' && *rcp <= 'f')
d = *rcp - 'a' + 10;
else if (*rcp >= 'A' && *rcp <= 'F')
d = *rcp - 'A' + 10;
else
break;
if (n&~(~0UL >> 4))
overflow = 1;
else
n = (n<<4) + d;
}
if ((char *)rcp - token <= 2)
error("invalid hexadecimal constant `%S'\n", token, (char *)rcp-token);
cp = rcp;
tsym = icon(n, overflow, 16);
} else if (*token == '0') {
int err = 0, overflow = 0;
for ( ; map[*rcp]&DIGIT; rcp++) {
if (*rcp == '8' || *rcp == '9')
err = 1;
if (n&~(~0UL >> 3))
overflow = 1;
else
n = (n<<3) + (*rcp - '0');
}
if (*rcp == '.' || *rcp == 'e' || *rcp == 'E') {
cp = rcp;
tsym = fcon();
return FCON;
}
cp = rcp;
tsym = icon(n, overflow, 8);
if (err)
error("invalid octal constant `%S'\n", token, (char*)cp-token);
} else {
int overflow = 0;
for (n = *token - '0'; map[*rcp]&DIGIT; ) {
int d = *rcp++ - '0';
if (n > (ULONG_MAX - d)/10)
overflow = 1;
else
n = 10*n + d;
}
if (*rcp == '.' || *rcp == 'e' || *rcp == 'E') {
cp = rcp;
tsym = fcon();
return FCON;
}
cp = rcp;
tsym = icon(n, overflow, 10);
}
return ICON;
}
case '.':
if (rcp[0] == '.' && rcp[1] == '.') {
cp += 2;
return ELLIPSIS;
}
if ((map[*rcp]&DIGIT) == 0)
return '.';
if (limit - rcp < MAXLINE) {
cp = rcp - 1;
fillbuf();
rcp = ++cp;
}
assert(cp == rcp);
cp = rcp - 1;
token = (char *)cp;
tsym = fcon();
return FCON;
case 'L':
if (*rcp == '\'') {
unsigned int *s = scon(*cp, wcput, wcbuf);
if (s - wcbuf > 2)
warning("excess characters in wide-character literal ignored\n");
tval.type = widechar;
tval.u.c.v.u = wcbuf[0];
tsym = &tval;
return ICON;
} else if (*rcp == '"') {
unsigned int *s = scon(*cp, wcput, wcbuf);
tval.type = array(widechar, s - wcbuf, 0);
tval.u.c.v.p = wcbuf;
tsym = &tval;
return SCON;
} else
goto id;
case '\'': {
char *s = scon(*--cp, cput, cbuf);
if (s - cbuf > 2)
warning("excess characters in multibyte character literal ignored\n");
tval.type = inttype;
if (chartype->op == INT)
tval.u.c.v.i = extend(cbuf[0], chartype);
else
tval.u.c.v.i = cbuf[0]&0xFF;
tsym = &tval;
return ICON;
}
case '"': {
char *s = scon(*--cp, cput, cbuf);
tval.type = array(chartype, s - cbuf, 0);
tval.u.c.v.p = cbuf;
tsym = &tval;
return SCON;
}
case 'a':
if (rcp[0] == 'u'
&& rcp[1] == 't'
&& rcp[2] == 'o'
&& !(map[rcp[3]]&(DIGIT|LETTER))) {
cp = rcp + 3;
return AUTO;
}
goto id;
case 'b':
if (rcp[0] == 'r'
&& rcp[1] == 'e'
&& rcp[2] == 'a'
&& rcp[3] == 'k'
&& !(map[rcp[4]]&(DIGIT|LETTER))) {
cp = rcp + 4;
return BREAK;
}
goto id;
case 'c':
if (rcp[0] == 'a'
&& rcp[1] == 's'
&& rcp[2] == 'e'
&& !(map[rcp[3]]&(DIGIT|LETTER))) {
cp = rcp + 3;
return CASE;
}
if (rcp[0] == 'h'
&& rcp[1] == 'a'
&& rcp[2] == 'r'
&& !(map[rcp[3]]&(DIGIT|LETTER))) {
cp = rcp + 3;
tsym = chartype->u.sym;
return CHAR;
}
if (rcp[0] == 'o'
&& rcp[1] == 'n'
&& rcp[2] == 's'
&& rcp[3] == 't'
&& !(map[rcp[4]]&(DIGIT|LETTER))) {
cp = rcp + 4;
return CONST;
}
if (rcp[0] == 'o'
&& rcp[1] == 'n'
&& rcp[2] == 't'
&& rcp[3] == 'i'
&& rcp[4] == 'n'
&& rcp[5] == 'u'
&& rcp[6] == 'e'
&& !(map[rcp[7]]&(DIGIT|LETTER))) {
cp = rcp + 7;
return CONTINUE;
}
goto id;
case 'd':
if (rcp[0] == 'e'
&& rcp[1] == 'f'
&& rcp[2] == 'a'
&& rcp[3] == 'u'
&& rcp[4] == 'l'
&& rcp[5] == 't'
&& !(map[rcp[6]]&(DIGIT|LETTER))) {
cp = rcp + 6;
return DEFAULT;
}
if (rcp[0] == 'o'
&& rcp[1] == 'u'
&& rcp[2] == 'b'
&& rcp[3] == 'l'
&& rcp[4] == 'e'
&& !(map[rcp[5]]&(DIGIT|LETTER))) {
cp = rcp + 5;
tsym = doubletype->u.sym;
return DOUBLE;
}
if (rcp[0] == 'o'
&& !(map[rcp[1]]&(DIGIT|LETTER))) {
cp = rcp + 1;
return DO;
}
goto id;
case 'e':
if (rcp[0] == 'l'
&& rcp[1] == 's'
&& rcp[2] == 'e'
&& !(map[rcp[3]]&(DIGIT|LETTER))) {
cp = rcp + 3;
return ELSE;
}
if (rcp[0] == 'n'
&& rcp[1] == 'u'
&& rcp[2] == 'm'
&& !(map[rcp[3]]&(DIGIT|LETTER))) {
cp = rcp + 3;
return ENUM;
}
if (rcp[0] == 'x'
&& rcp[1] == 't'
&& rcp[2] == 'e'
&& rcp[3] == 'r'
&& rcp[4] == 'n'
&& !(map[rcp[5]]&(DIGIT|LETTER))) {
cp = rcp + 5;
return EXTERN;
}
goto id;
case 'f':
if (rcp[0] == 'l'
&& rcp[1] == 'o'
&& rcp[2] == 'a'
&& rcp[3] == 't'
&& !(map[rcp[4]]&(DIGIT|LETTER))) {
cp = rcp + 4;
tsym = floattype->u.sym;
return FLOAT;
}
if (rcp[0] == 'o'
&& rcp[1] == 'r'
&& !(map[rcp[2]]&(DIGIT|LETTER))) {
cp = rcp + 2;
return FOR;
}
goto id;
case 'g':
if (rcp[0] == 'o'
&& rcp[1] == 't'
&& rcp[2] == 'o'
&& !(map[rcp[3]]&(DIGIT|LETTER))) {
cp = rcp + 3;
return GOTO;
}
goto id;
case 'l':
if (rcp[0] == 'o'
&& rcp[1] == 'n'
&& rcp[2] == 'g'
&& !(map[rcp[3]]&(DIGIT|LETTER))) {
cp = rcp + 3;
return LONG;
}
goto id;
case 'r':
if (rcp[0] == 'e'
&& rcp[1] == 'g'
&& rcp[2] == 'i'
&& rcp[3] == 's'
&& rcp[4] == 't'
&& rcp[5] == 'e'
&& rcp[6] == 'r'
&& !(map[rcp[7]]&(DIGIT|LETTER))) {
cp = rcp + 7;
return REGISTER;
}
if (rcp[0] == 'e'
&& rcp[1] == 't'
&& rcp[2] == 'u'
&& rcp[3] == 'r'
&& rcp[4] == 'n'
&& !(map[rcp[5]]&(DIGIT|LETTER))) {
cp = rcp + 5;
return RETURN;
}
goto id;
case 's':
if (rcp[0] == 'h'
&& rcp[1] == 'o'
&& rcp[2] == 'r'
&& rcp[3] == 't'
&& !(map[rcp[4]]&(DIGIT|LETTER))) {
cp = rcp + 4;
return SHORT;
}
if (rcp[0] == 'i'
&& rcp[1] == 'g'
&& rcp[2] == 'n'
&& rcp[3] == 'e'
&& rcp[4] == 'd'
&& !(map[rcp[5]]&(DIGIT|LETTER))) {
cp = rcp + 5;
return SIGNED;
}
if (rcp[0] == 'i'
&& rcp[1] == 'z'
&& rcp[2] == 'e'
&& rcp[3] == 'o'
&& rcp[4] == 'f'
&& !(map[rcp[5]]&(DIGIT|LETTER))) {
cp = rcp + 5;
return SIZEOF;
}
if (rcp[0] == 't'
&& rcp[1] == 'a'
&& rcp[2] == 't'
&& rcp[3] == 'i'
&& rcp[4] == 'c'
&& !(map[rcp[5]]&(DIGIT|LETTER))) {
cp = rcp + 5;
return STATIC;
}
if (rcp[0] == 't'
&& rcp[1] == 'r'
&& rcp[2] == 'u'
&& rcp[3] == 'c'
&& rcp[4] == 't'
&& !(map[rcp[5]]&(DIGIT|LETTER))) {
cp = rcp + 5;
return STRUCT;
}
if (rcp[0] == 'w'
&& rcp[1] == 'i'
&& rcp[2] == 't'
&& rcp[3] == 'c'
&& rcp[4] == 'h'
&& !(map[rcp[5]]&(DIGIT|LETTER))) {
cp = rcp + 5;
return SWITCH;
}
goto id;
case 't':
if (rcp[0] == 'y'
&& rcp[1] == 'p'
&& rcp[2] == 'e'
&& rcp[3] == 'd'
&& rcp[4] == 'e'
&& rcp[5] == 'f'
&& !(map[rcp[6]]&(DIGIT|LETTER))) {
cp = rcp + 6;
return TYPEDEF;
}
goto id;
case 'u':
if (rcp[0] == 'n'
&& rcp[1] == 'i'
&& rcp[2] == 'o'
&& rcp[3] == 'n'
&& !(map[rcp[4]]&(DIGIT|LETTER))) {
cp = rcp + 4;
return UNION;
}
if (rcp[0] == 'n'
&& rcp[1] == 's'
&& rcp[2] == 'i'
&& rcp[3] == 'g'
&& rcp[4] == 'n'
&& rcp[5] == 'e'
&& rcp[6] == 'd'
&& !(map[rcp[7]]&(DIGIT|LETTER))) {
cp = rcp + 7;
return UNSIGNED;
}
goto id;
case 'v':
if (rcp[0] == 'o'
&& rcp[1] == 'i'
&& rcp[2] == 'd'
&& !(map[rcp[3]]&(DIGIT|LETTER))) {
cp = rcp + 3;
tsym = voidtype->u.sym;
return VOID;
}
if (rcp[0] == 'o'
&& rcp[1] == 'l'
&& rcp[2] == 'a'
&& rcp[3] == 't'
&& rcp[4] == 'i'
&& rcp[5] == 'l'
&& rcp[6] == 'e'
&& !(map[rcp[7]]&(DIGIT|LETTER))) {
cp = rcp + 7;
return VOLATILE;
}
goto id;
case 'w':
if (rcp[0] == 'h'
&& rcp[1] == 'i'
&& rcp[2] == 'l'
&& rcp[3] == 'e'
&& !(map[rcp[4]]&(DIGIT|LETTER))) {
cp = rcp + 4;
return WHILE;
}
goto id;
case '_':
if (rcp[0] == '_'
&& rcp[1] == 't'
&& rcp[2] == 'y'
&& rcp[3] == 'p'
&& rcp[4] == 'e'
&& rcp[5] == 'c'
&& rcp[6] == 'o'
&& rcp[7] == 'd'
&& rcp[8] == 'e'
&& !(map[rcp[9]]&(DIGIT|LETTER))) {
cp = rcp + 9;
return TYPECODE;
}
if (rcp[0] == '_'
&& rcp[1] == 'f'
&& rcp[2] == 'i'
&& rcp[3] == 'r'
&& rcp[4] == 's'
&& rcp[5] == 't'
&& rcp[6] == 'a'
&& rcp[7] == 'r'
&& rcp[8] == 'g'
&& !(map[rcp[9]]&(DIGIT|LETTER))) {
cp = rcp + 9;
return FIRSTARG;
}
goto id;
default:
if ((map[cp[-1]]&BLANK) == 0)
if (cp[-1] < ' ' || cp[-1] >= 0177)
error("illegal character `\\0%o'\n", cp[-1]);
else
error("illegal character `%c'\n", cp[-1]);
}
}
}
static Symbol icon(unsigned long n, int overflow, int base) {
if ((*cp=='u'||*cp=='U') && (cp[1]=='l'||cp[1]=='L')
|| (*cp=='l'||*cp=='L') && (cp[1]=='u'||cp[1]=='U')) {
tval.type = unsignedlong;
cp += 2;
} else if (*cp == 'u' || *cp == 'U') {
if (overflow || n > unsignedtype->u.sym->u.limits.max.i)
tval.type = unsignedlong;
else
tval.type = unsignedtype;
cp += 1;
} else if (*cp == 'l' || *cp == 'L') {
if (overflow || n > longtype->u.sym->u.limits.max.i)
tval.type = unsignedlong;
else
tval.type = longtype;
cp += 1;
} else if (overflow || n > longtype->u.sym->u.limits.max.i)
tval.type = unsignedlong;
else if (n > inttype->u.sym->u.limits.max.i)
tval.type = longtype;
else if (base != 10 && n > inttype->u.sym->u.limits.max.i)
tval.type = unsignedtype;
else
tval.type = inttype;
switch (tval.type->op) {
case INT:
if (overflow || n > tval.type->u.sym->u.limits.max.i) {
warning("overflow in constant `%S'\n", token,
(char*)cp - token);
tval.u.c.v.i = tval.type->u.sym->u.limits.max.i;
} else
tval.u.c.v.i = n;
break;
case UNSIGNED:
if (overflow || n > tval.type->u.sym->u.limits.max.u) {
warning("overflow in constant `%S'\n", token,
(char*)cp - token);
tval.u.c.v.u = tval.type->u.sym->u.limits.max.u;
} else
tval.u.c.v.u = n;
break;
default: assert(0);
}
ppnumber("integer");
return &tval;
}
static void ppnumber(char *which) {
unsigned char *rcp = cp--;
for ( ; (map[*cp]&(DIGIT|LETTER)) || *cp == '.'; cp++)
if ((cp[0] == 'E' || cp[0] == 'e')
&& (cp[1] == '-' || cp[1] == '+'))
cp++;
if (cp > rcp)
error("`%S' is a preprocessing number but an invalid %s constant\n", token,
(char*)cp-token, which);
}
static Symbol fcon(void) {
if (*cp == '.')
do
cp++;
while (map[*cp]&DIGIT);
if (*cp == 'e' || *cp == 'E') {
if (*++cp == '-' || *cp == '+')
cp++;
if (map[*cp]&DIGIT)
do
cp++;
while (map[*cp]&DIGIT);
else
error("invalid floating constant `%S'\n", token,
(char*)cp - token);
}
errno = 0;
tval.u.c.v.d = strtod(token, NULL);
if (errno == ERANGE)
warning("overflow in floating constant `%S'\n", token,
(char*)cp - token);
if (*cp == 'f' || *cp == 'F') {
++cp;
if (tval.u.c.v.d > floattype->u.sym->u.limits.max.d)
warning("overflow in floating constant `%S'\n", token,
(char*)cp - token);
tval.type = floattype;
} else if (*cp == 'l' || *cp == 'L') {
cp++;
tval.type = longdouble;
} else {
if (tval.u.c.v.d > doubletype->u.sym->u.limits.max.d)
warning("overflow in floating constant `%S'\n", token,
(char*)cp - token);
tval.type = doubletype;
}
ppnumber("floating");
return &tval;
}
static void *cput(int c, void *cl) {
char *s = cl;
if (c < 0 || c > 255)
warning("overflow in escape sequence with resulting value `%d'\n", c);
*s++ = c;
return s;
}
static void *wcput(int c, void *cl) {
unsigned int *s = cl;
*s++ = c;
return s;
}
static void *scon(int q, void *put(int c, void *cl), void *cl) {
int n = 0, nbad = 0;
do {
cp++;
while (*cp != q) {
int c;
if (map[*cp]&NEWLINE) {
if (cp < limit)
break;
cp++;
nextline();
if (cp == limit)
break;
continue;
}
c = *cp++;
if (c == '\\') {
if (map[*cp]&NEWLINE) {
if (cp < limit)
break;
cp++;
nextline();
}
if (limit - cp < MAXTOKEN)
fillbuf();
c = backslash(q);
} else if (c < 0 || c > 255 || map[c] == 0)
nbad++;
if (n++ < BUFSIZE)
cl = put(c, cl);
}
if (*cp == q)
cp++;
else
error("missing %c\n", q);
} while (q == '"' && getchr() == '"');
cl = put(0, cl);
if (n >= BUFSIZE)
error("%s literal too long\n", q == '"' ? "string" : "character");
if (Aflag >= 2 && q == '"' && n > 509)
warning("more than 509 characters in a string literal\n");
if (Aflag >= 2 && nbad > 0)
warning("%s literal contains non-portable characters\n",
q == '"' ? "string" : "character");
return cl;
}
int getchr(void) {
for (;;) {
while (map[*cp]&BLANK)
cp++;
if (!(map[*cp]&NEWLINE))
return *cp;
cp++;
nextline();
if (cp == limit)
return EOI;
}
}
static int backslash(int q) {
unsigned int c;
switch (*cp++) {
case 'a': return 7;
case 'b': return '\b';
case 'f': return '\f';
case 'n': return '\n';
case 'r': return '\r';
case 't': return '\t';
case 'v': return '\v';
case '\'': case '"': case '\\': case '\?': break;
case 'x': {
int overflow = 0;
if ((map[*cp]&(DIGIT|HEX)) == 0) {
if (*cp < ' ' || *cp == 0177)
error("ill-formed hexadecimal escape sequence\n");
else
error("ill-formed hexadecimal escape sequence `\\x%c'\n", *cp);
if (*cp != q)
cp++;
return 0;
}
for (c = 0; map[*cp]&(DIGIT|HEX); cp++) {
if (c >> (8*widechar->size - 4))
overflow = 1;
if (map[*cp]&DIGIT)
c = (c<<4) + *cp - '0';
else
c = (c<<4) + (*cp&~040) - 'A' + 10;
}
if (overflow)
warning("overflow in hexadecimal escape sequence\n");
return c&ones(8*widechar->size);
}
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
c = *(cp-1) - '0';
if (*cp >= '0' && *cp <= '7') {
c = (c<<3) + *cp++ - '0';
if (*cp >= '0' && *cp <= '7')
c = (c<<3) + *cp++ - '0';
}
return c;
default:
if (cp[-1] < ' ' || cp[-1] >= 0177)
warning("unrecognized character escape sequence\n");
else
warning("unrecognized character escape sequence `\\%c'\n", cp[-1]);
}
return cp[-1];
}
See more files for this project here