120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
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/* USER-OPTION HANDLING */
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#include <alloc.h>
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#include "idfsize.h"
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#include "maxincl.h"
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#include "class.h"
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#include "macro.h"
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#include "idf.h"
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char options[128]; /* one for every char */
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int inc_pos = 1; /* place where next -I goes */
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char *inctable[MAXINCL] = { /* list for includes */
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".",
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"/usr/include",
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0
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};
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extern int idfsize;
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int txt2int();
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do_option(text)
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char *text;
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{
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switch(*text++) {
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case '-':
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options[*text] = 1;
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break;
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default:
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error("illegal option: %c", text[-1]);
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break;
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case 'C' : /* comment output */
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options['C'] = 1;
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break;
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case 'D' : /* -Dname : predefine name */
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{
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register char *cp = text, *name, *mactext;
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if (class(*cp) != STIDF) {
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error("identifier missing in -D%s", text);
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break;
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}
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name = cp;
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while (*cp && in_idf(*cp))
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++cp;
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if (!*cp) /* -Dname */
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mactext = "1";
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else
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if (*cp == '=') { /* -Dname=text */
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*cp++ = '\0'; /* end of name */
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mactext = cp;
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}
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else { /* -Dname?? */
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error("malformed option -D%s", text);
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break;
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}
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macro_def(str2idf(name, 0), mactext, -1, strlen(mactext), NOFLAG);
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break;
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}
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case 'I' : /* -Ipath : insert "path" into include list */
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if (*text) {
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register int i = inc_pos++;
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register char *new = text;
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while (new) {
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register char *tmp = inctable[i];
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inctable[i++] = new;
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if (i == MAXINCL)
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fatal("too many -I options");
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new = tmp;
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}
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}
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else inctable[inc_pos] = 0;
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break;
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case 'M': /* maximum identifier length */
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idfsize = txt2int(&text);
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if (*text)
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error("malformed -M option");
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if (idfsize > IDFSIZE) {
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warning("maximum identifier length is %d", IDFSIZE);
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idfsize = IDFSIZE;
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}
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if (idfsize < 8) {
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warning("minimum identifier length is 8");
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idfsize = 8;
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}
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break;
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case 'P' : /* run preprocessor stand-alone, without #'s */
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options['P'] = 1;
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break;
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case 'U' : /* -Uname : undefine predefined */
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if (*text) {
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register struct idf *idef = findidf(text);
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if (idef && idef->id_macro) {
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free_macro(idef->id_macro);
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idef->id_macro = (struct macro *) 0;
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}
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}
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break;
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}
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}
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int
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txt2int(tp)
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char **tp;
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{
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/* the integer pointed to by *tp is read, while increasing
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*tp; the resulting value is yielded.
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*/
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register int val = 0;
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register int ch;
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while (ch = **tp, ch >= '0' && ch <= '9') {
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val = val * 10 + ch - '0';
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(*tp)++;
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}
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return val;
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}
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