forked from wym6912/sreformat
-
Notifications
You must be signed in to change notification settings - Fork 0
/
getopt.c
253 lines (228 loc) · 7.65 KB
/
getopt.c
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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
/*****************************************************************
* HMMER - Biological sequence analysis with profile HMMs
* Copyright (C) 1992-2003 Washington University School of Medicine
* All Rights Reserved
*
* This source code is distributed under the terms of the
* GNU General Public License. See the files COPYING and LICENSE
* for details.
*****************************************************************/
/* CVS $Id: getopt.c,v 1.8 2003/04/14 16:00:16 eddy Exp $
*/
#include "squidconf.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "squid.h"
/* Function: Getopt()
*
* Purpose: Portable command line option parsing with abbreviated
* option switches. Replaces UNIX getopt(). Using UNIX getopt()
* hinders portability to non-UNIX platforms, and getopt()
* is also limited to single letter options.
*
* Getopt() implements a superset of UNIX getopt().
* All of getopt()'s single-character switch behavior
* is emulated, and "--" by itself terminates the options.
* Additionally, Getopt() provides extended switches
* like "--youroptionhere", and Getopt() type checks
* arguments.
*
* Extended options must start with "--", as in "--option1".
* Normal options must start with "-", as in "-o".
* Normal options may be concatenated, as in "-a -b" == "-ab".
*
* See bottom of this .c file after #fdef GETOPT_TESTDRIVER
* for an example of calling Getopt().
*
* Args: argc - from main(). number of elems in argv.
* argv - from main(). argv[0] is the name of the command.
* opt - array of opt_s structures, defining option switches
* nopts - number of switches in opt
* usage - a (possibly long) string to print if usage error.
* ret_optind - RETURN: the index in argv[] of the next
* valid command-line token.
* ret_optname- RETURN: ptr to the name of option switch
* seen, or NULL if no option was seen.
* ret_optarg - RETURN: ptr to the optional argument, if any;
* NULL if option takes no argument.
*
* Return: 1 if a valid option was parsed.
* 0 if no option was found, and command-line parsing is complete.
* Die()'s here if an error is detected.
*/
int
Getopt(int argc, char **argv, struct opt_s *opt, int nopts, char *usage,
int *ret_optind, char **ret_optname, char **ret_optarg)
{
int i;
int arglen;
int nmatch;
static int optind = 1; /* init to 1 on first call */
static char *optptr = NULL; /* ptr to next valid switch */
int opti = 0; /* init only to silence gcc uninit warnings */
/* Check to see if we've run out of options.
* A '-' by itself is an argument (e.g. "read from stdin")
* not an option.
*/
if (optind >= argc || argv[optind][0] != '-' || strcmp(argv[optind], "-") == 0)
{
*ret_optind = optind;
*ret_optarg = NULL;
*ret_optname = NULL;
return 0;
}
/* Check to see if we're being told that this is the end
* of the options with the special "--" flag.
*/
if (strcmp(argv[optind], "--") == 0)
{
optind++;
*ret_optind = optind;
*ret_optname = NULL;
*ret_optarg = NULL;
return 0;
}
/* We have a real option. Find which one it is.
* We handle single letter switches "-o" separately
* from full switches "--option", based on the "-" vs. "--"
* prefix -- single letter switches can be concatenated
* as long as they don't have arguments.
*/
/* full option */
if (optptr == NULL && strncmp(argv[optind], "--", 2) == 0)
{
/* Use optptr to parse argument in options of form "--foo=666"
*/
if ((optptr = strchr(argv[optind], '=')) != NULL)
{ *optptr = '\0'; optptr++; }
arglen = strlen(argv[optind]);
nmatch = 0;
for (i = 0; i < nopts; i++)
if (opt[i].single == FALSE &&
strncmp(opt[i].name, argv[optind], arglen) == 0)
{
nmatch++;
opti = i;
if (arglen == strlen(opt[i].name)) break; /* exact match, stop now */
}
if (nmatch > 1 && arglen != strlen(opt[i].name))
Die("Option \"%s\" is ambiguous; please be more specific.\n%s",
argv[optind], usage);
if (nmatch == 0)
Die("No such option \"%s\".\n%s", argv[optind], usage);
*ret_optname = opt[opti].name;
/* Set the argument, if there is one
*/
if (opt[opti].argtype != sqdARG_NONE)
{
if (optptr != NULL)
{ /* --foo=666 style */
*ret_optarg = optptr;
optptr = NULL;
optind++;
}
else if (optind+1 >= argc)
Die("Option %s requires an argument\n%s", opt[opti].name, usage);
else /* "--foo 666" style */
{
*ret_optarg = argv[optind+1];
optind+=2;
}
}
else /* sqdARG_NONE */
{
if (optptr != NULL)
Die("Option %s does not take an argument\n%s", opt[opti].name, usage);
*ret_optarg = NULL;
optind++;
}
}
else /* else, a single letter option "-o" */
{
/* find the option */
if (optptr == NULL)
optptr = argv[optind]+1;
for (opti = -1, i = 0; i < nopts; i++)
if (opt[i].single == TRUE && *optptr == opt[i].name[1])
{ opti = i; break; }
if (opti == -1)
Die("No such option \"%c\".\n%s", *optptr, usage);
*ret_optname = opt[opti].name;
/* set the argument, if there is one */
if (opt[opti].argtype != sqdARG_NONE)
{
if (*(optptr+1) != '\0') /* attached argument */
{
*ret_optarg = optptr+1;
optind++;
}
else if (optind+1 < argc) /* unattached argument */
{
*ret_optarg = argv[optind+1];
optind+=2;
}
else Die("Option %s requires an argument\n%s", opt[opti].name, usage);
optptr = NULL; /* can't concatenate after an argument */
}
else /* sqdARG_NONE */
{
*ret_optarg = NULL;
if (*(optptr+1) != '\0') /* concatenation */
optptr++;
else
{
optind++; /* move to next field */
optptr = NULL;
}
}
}
/* Type check the argument, if there is one
*/
if (opt[opti].argtype != sqdARG_NONE)
{
if (opt[opti].argtype == sqdARG_INT && ! IsInt(*ret_optarg))
Die("Option %s requires an integer argument\n%s",
opt[opti].name, usage);
else if (opt[opti].argtype == sqdARG_FLOAT && ! IsReal(*ret_optarg))
Die("Option %s requires a numerical argument\n%s",
opt[opti].name, usage);
else if (opt[opti].argtype == sqdARG_CHAR && strlen(*ret_optarg) != 1)
Die("Option %s requires a single-character argument\n%s",
opt[opti].name, usage);
/* sqdARG_STRING is always ok, no type check necessary */
}
*ret_optind = optind;
return 1;
}
#ifdef GETOPT_TESTDRIVER
/* cc -DGETOPT_TESTDRIVER -L ~/lib/squid.linux/ getopt.c -lsquid
*/
struct opt_s OPTIONS[] = {
{ "--test1", FALSE, sqdARG_INT },
{ "--test2", FALSE, sqdARG_FLOAT },
{ "--test3", FALSE, sqdARG_STRING },
{ "--test4", FALSE, sqdARG_CHAR },
{ "-a", TRUE, sqdARG_NONE },
{ "-b", TRUE, sqdARG_INT },
};
#define NOPTIONS (sizeof(OPTIONS) / sizeof(struct opt_s))
int
main(int argc, char **argv)
{
int optind;
char *optarg;
char *optname;
while (Getopt(argc, argv, OPTIONS, NOPTIONS, "Usage/help here",
&optind, &optname, &optarg))
{
printf("Option: index: %d name: %s argument: %s\n",
optind, optname, optarg);
}
while (optind < argc)
{
printf("Argument: index: %d name: %s\n", optind, argv[optind]);
optind++;
}
}
#endif /*GETOPT_TESTDRIVER*/