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1.1 root 1: /* lexan.c - lexan */
2:
3: #include <conf.h>
4: #include <kernel.h>
5: #include <shell.h>
6:
7: /*------------------------------------------------------------------------
8: * lexan - ad hoc lexical analyzer to divide command line into tokens
9: *------------------------------------------------------------------------
10: */
11: lexan(line)
12: char *line;
13: {
14: char **tokptr;
15: int ntok;
16: char *p;
17: char ch;
18: char *to;
19: char quote;
20:
21: to = Shl.shargst; /* area to place token strings */
22: tokptr = &Shl.shtok[ntok = 0]; /* array of ptrs to tokens */
23: for (p = line ; *p!='\0' && *p!='\n' && ntok < SHMAXTOK ;) {
24: while ( (ch = *p) == ' ') /* skip leading blanks */
25: p++;
26: if (ch == '\0' || ch == '\n') /* end of line or string*/
27: return(ntok);
28: *tokptr++ = to; /* save start of token */
29: Shl.shtktyp[ntok++] = ch;
30: if (ch == '"' || ch == '\'') { /* check for quoted str.*/
31: quote = ch;
32: for (p++ ; (ch = *p++) != quote && ch != '\n'
33: && ch != '\0' ; )
34: *to++ = ch;
35: if (ch != quote)
36: return(SYSERR);
37: } else { /* other possible tokens */
38: *to++ = *p++;
39: if (ch!='>' && ch!='<' && ch!='&')
40: while ((ch = *p)!='\n' && ch !='\0' &&
41: ch!='<' && ch!='>' && ch!=' ' &&
42: ch!='"' && ch!='\'' && ch !='&')
43: *to++= *p++; /* copy alphamerics*/
44: }
45: *to++ = NULLCH; /* terminate token string */
46: }
47: return(ntok);
48: }
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