extern int esopt(const char *options) {
int c;
const char *arg, *opt;
assert(usage != NULL);
assert(termarg == NULL);
if (nextchar == 0) {
if (args == NULL)
return EOF;
assert(args->term != NULL);
arg = getstr(args->term);
if (*arg != '-')
return EOF;
if (arg[1] == '-' && arg[2] == '\0') {
args = args->next;
return EOF;
}
nextchar = 1;
} else {
assert(args != NULL && args->term != NULL);
arg = getstr(args->term);
}
c = arg[nextchar++];
opt = strchr(options, c);
if (opt == NULL) {
const char *msg = usage;
usage = NULL;
args = NULL;
nextchar = 0;
fail(invoker, "illegal option: -%c -- usage: %s", c, msg);
}
if (arg[nextchar] == '\0') {
nextchar = 0;
args = args->next;
}
if (opt[1] == ':') {
if (args == NULL) {
const char *msg = usage;
fail(invoker, "option -%c expects an argument -- usage: %s", c, msg);
}
termarg = (nextchar == 0)
? args->term
: mkterm(gcdup(arg + nextchar), NULL);
nextchar = 0;
args = args->next;
}
return c;
}
static List *extractsinglematch(const char *subject, const char *pattern,
const char *quoting, List *result) {
int i;
const char *s;
if (!haswild(pattern, quoting) /* no wildcards, so no matches */
|| !match(subject, pattern, quoting))
return NULL;
for (s = subject, i = 0; pattern[i] != '\0'; s++) {
if (ISQUOTED(quoting, i))
i++;
else {
int c = pattern[i++];
switch (c) {
case '*': {
const char *begin;
if (pattern[i] == '\0')
return mklist(mkstr(gcdup(s)), result);
for (begin = s;; s++) {
const char *q = TAILQUOTE(quoting, i);
assert(*s != '\0');
if (match(s, pattern + i, q)) {
result = mklist(mkstr(gcndup(begin, s - begin)), result);
return haswild(pattern + i, q)
? extractsinglematch(s, pattern + i, q, result)
: result;
}
}
}
case '[': {
int j = rangematch(pattern + i, TAILQUOTE(quoting, i), *s);
assert(j != RANGE_FAIL);
if (j == RANGE_ERROR) {
assert(*s == '[');
break;
}
i += j;
}
/* FALLTHROUGH */
case '?':
result = mklist(mkstr(str("%c", *s)), result);
break;
default:
break;
}
}
}
return result;
}
extern int yylex(void) {
static Boolean dollar = FALSE;
int c;
size_t i; /* The purpose of all these local assignments is to */
const char *meta; /* allow optimizing compilers like gcc to load these */
char *buf = tokenbuf; /* values into registers. On a sparc this is a */
YYSTYPE *y = &yylval; /* win, in code size *and* execution time */
if (goterror) {
goterror = FALSE;
return NL;
}
/* rc variable-names may contain only alnum, '*' and '_', so use dnw if we are scanning one. */
meta = (dollar ? dnw : nw);
dollar = FALSE;
if (newline) {
--input->lineno; /* slight space optimization; print_prompt2() always increments lineno */
print_prompt2();
newline = FALSE;
}
top: while ((c = GETC()) == ' ' || c == '\t')
w = NW;
if (c == EOF)
return ENDFILE;
if (!meta[(unsigned char) c]) { /* it's a word or keyword. */
InsertFreeCaret();
w = RW;
i = 0;
do {
buf[i++] = c;
if (i >= bufsize)
buf = tokenbuf = erealloc(buf, bufsize *= 2);
} while ((c = GETC()) != EOF && !meta[(unsigned char) c]);
UNGETC(c);
buf[i] = '\0';
w = KW;
if (buf[1] == '\0') {
int k = *buf;
if (k == '@' || k == '~')
return k;
} else if (*buf == 'f') {
if (streq(buf + 1, "n")) return FN;
if (streq(buf + 1, "or")) return FOR;
} else if (*buf == 'l') {
if (streq(buf + 1, "ocal")) return LOCAL;
if (streq(buf + 1, "et")) return LET;
} else if (streq(buf, "~~"))
return EXTRACT;
else if (streq(buf, "%closure"))
return CLOSURE;
w = RW;
y->str = gcdup(buf);
return WORD;
}
if (c == '`' || c == '!' || c == '$' || c == '\'') {
InsertFreeCaret();
if (c == '!')
w = KW;
}
switch (c) {
case '!':
return '!';
case '`':
c = GETC();
if (c == '`')
return BACKBACK;
UNGETC(c);
return '`';
case '$':
dollar = TRUE;
switch (c = GETC()) {
case '#': return COUNT;
case '^': return FLAT;
case '&': return PRIM;
default: UNGETC(c); return '$';
}
case '\'':
w = RW;
i = 0;
while ((c = GETC()) != '\'' || (c = GETC()) == '\'') {
buf[i++] = c;
if (c == '\n')
print_prompt2();
if (c == EOF) {
w = NW;
scanerror("eof in quoted string");
return ERROR;
}
if (i >= bufsize)
buf = tokenbuf = erealloc(buf, bufsize *= 2);
}
UNGETC(c);
buf[i] = '\0';
y->str = gcdup(buf);
return QWORD;
case '\\':
if ((c = GETC()) == '\n') {
print_prompt2();
UNGETC(' ');
goto top; /* Pretend it was just another space. */
}
if (c == EOF) {
UNGETC(EOF);
goto badescape;
}
UNGETC(c);
c = '\\';
InsertFreeCaret();
w = RW;
c = GETC();
switch (c) {
case 'a': *buf = '\a'; break;
case 'b': *buf = '\b'; break;
case 'e': *buf = '\033'; break;
case 'f': *buf = '\f'; break;
case 'n': *buf = '\n'; break;
case 'r': *buf = '\r'; break;
case 't': *buf = '\t'; break;
case 'x': case 'X': {
int n = 0;
for (;;) {
c = GETC();
if (!isxdigit(c))
break;
n = (n << 4)
| (c - (isdigit(c) ? '0' : ((islower(c) ? 'a' : 'A') - 0xA)));
}
if (n == 0)
goto badescape;
UNGETC(c);
*buf = n;
break;
}
case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': {
int n = 0;
do {
n = (n << 3) | (c - '0');
c = GETC();
} while (isodigit(c));
if (n == 0)
goto badescape;
UNGETC(c);
*buf = n;
break;
}
default:
if (isalnum(c)) {
badescape:
scanerror("bad backslash escape");
return ERROR;
}
*buf = c;
break;
}
buf[1] = 0;
y->str = gcdup(buf);
return QWORD;
case '#':
while ((c = GETC()) != '\n') /* skip comment until newline */
if (c == EOF)
return ENDFILE;
/* FALLTHROUGH */
case '\n':
input->lineno++;
newline = TRUE;
w = NW;
return NL;
case '(':
if (w == RW) /* not keywords, so let & friends work */
c = SUB;
/* FALLTHROUGH */
case ';':
case '^':
case ')':
case '=':
case '{': case '}':
w = NW;
return c;
case '&':
w = NW;
c = GETC();
if (c == '&')
return ANDAND;
UNGETC(c);
return '&';
case '|': {
int p[2];
w = NW;
c = GETC();
if (c == '|')
return OROR;
if (!getfds(p, c, 1, 0))
return ERROR;
if (p[1] == CLOSED) {
scanerror("expected digit after '='"); /* can't close a pipe */
return ERROR;
}
y->tree = mk(nPipe, p[0], p[1]);
return PIPE;
}
{
char *cmd;
int fd[2];
case '<':
fd[0] = 0;
if ((c = GETC()) == '>')
if ((c = GETC()) == '>') {
c = GETC();
cmd = "%open-append";
} else
cmd = "%open-write";
else if (c == '<')
if ((c = GETC()) == '<') {
c = GETC();
cmd = "%here";
} else
cmd = "%heredoc";
else if (c == '=')
return CALL;
else
cmd = "%open";
goto redirection;
case '>':
fd[0] = 1;
if ((c = GETC()) == '>')
if ((c = GETC()) == '<') {
c = GETC();
cmd = "%open-append";
} else
cmd = "%append";
else if (c == '<') {
c = GETC();
cmd = "%open-create";
} else
cmd = "%create";
goto redirection;
redirection:
w = NW;
if (!getfds(fd, c, fd[0], DEFAULT))
return ERROR;
if (fd[1] != DEFAULT) {
y->tree = (fd[1] == CLOSED)
? mkclose(fd[0])
: mkdup(fd[0], fd[1]);
return DUP;
}
y->tree = mkredircmd(cmd, fd[0]);
return REDIR;
}
default:
assert(c != '\0');
w = NW;
return c; /* don't know what it is, let yacc barf on it */
}
}
