1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
* Copyright 1987, 1988 by MIT Student Information Processing Board
*
* For copyright info, see copyright.h.
*/
#include "ss_internal.h"
#include "copyright.h"
#ifndef lint
static char const rcsid[] =
"$Header: /mit/zephyr/repository/zephyr/lib/ss/parse.c,v 1.3 1995/06/30 22:02:44 ghudson Exp $";
#endif
enum parse_mode { WHITESPACE, TOKEN, QUOTED_STRING };
/*
* parse(line_ptr, argc_ptr)
*
* Function:
* Parses line, dividing at whitespace, into tokens, returns
* the "argc" and "argv" values.
* Arguments:
* line_ptr (char *)
* Pointer to text string to be parsed.
* argc_ptr (int *)
* Where to put the "argc" (number of tokens) value.
* Returns:
* argv (char **)
* Series of pointers to parsed tokens.
*/
#define NEW_ARGV(old,n) (char **)realloc((char *)old,\
(unsigned)(n+2)*sizeof(char*))
char **ss_parse (sci_idx, line_ptr, argc_ptr)
int sci_idx;
register char *line_ptr;
int *argc_ptr;
{
register char **argv, *cp;
register int argc;
register enum parse_mode parse_mode;
*argc_ptr = 0; /* In case of error return something sane */
argv = (char **) malloc (sizeof(char *));
if (argv == (char **)NULL) {
ss_error(sci_idx, errno, "Can't allocate storage");
return(argv);
}
*argv = (char *)NULL;
argc = 0;
parse_mode = WHITESPACE; /* flushing whitespace */
cp = line_ptr; /* cp is for output */
while (1) {
#ifdef DEBUG
{
printf ("character `%c', mode %d\n", *line_ptr, parse_mode);
}
#endif
while (parse_mode == WHITESPACE) {
if (*line_ptr == '\0')
goto end_of_line;
if (*line_ptr == ' ' || *line_ptr == '\t') {
line_ptr++;
continue;
}
if (*line_ptr == '"') {
/* go to quoted-string mode */
parse_mode = QUOTED_STRING;
cp = line_ptr++;
argv = NEW_ARGV (argv, argc);
argv[argc++] = cp;
argv[argc] = NULL;
}
else {
/* random-token mode */
parse_mode = TOKEN;
cp = line_ptr;
argv = NEW_ARGV (argv, argc);
argv[argc++] = line_ptr;
argv[argc] = NULL;
}
}
while (parse_mode == TOKEN) {
if (*line_ptr == '\0') {
*cp++ = '\0';
goto end_of_line;
}
else if (*line_ptr == ' ' || *line_ptr == '\t') {
*cp++ = '\0';
line_ptr++;
parse_mode = WHITESPACE;
}
else if (*line_ptr == '"') {
line_ptr++;
parse_mode = QUOTED_STRING;
}
else {
*cp++ = *line_ptr++;
}
}
while (parse_mode == QUOTED_STRING) {
if (*line_ptr == '\0') {
ss_error (sci_idx, 0,
"Unbalanced quotes in command line");
free (argv);
return NULL;
}
else if (*line_ptr == '"') {
if (*++line_ptr == '"') {
*cp++ = '"';
line_ptr++;
}
else {
parse_mode = TOKEN;
}
}
else {
*cp++ = *line_ptr++;
}
}
}
end_of_line:
*argc_ptr = argc;
#ifdef DEBUG
{
int i;
printf ("argc = %d\n", argc);
for (i = 0; i <= argc; i++)
printf ("\targv[%2d] = `%s'\n", i,
argv[i] ? argv[i] : "<NULL>");
}
#endif
return(argv);
}
|
