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
|
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "popt.h"
#include "poptint.h"
static void displayArgs(poptContext con, int key, const char * arg,
void * data) {
if (key == '?')
poptPrintHelp(con, stderr, 0);
else
poptPrintUsage(con, stderr, 0);
exit(0);
}
struct poptOption poptHelpOptions[] = {
{ NULL, '\0', POPT_ARG_CALLBACK, &displayArgs, '\0', NULL },
{ "help", '?', 0, NULL, '?', "Show this help message" },
{ "usage", '\0', 0, NULL, 'u', "Display brief usage message" },
{ NULL, '\0', 0, NULL, 0 }
} ;
static void singleOptionHelp(FILE * f, int maxLeftCol,
const struct poptOption * opt) {
int indentLength = maxLeftCol + 5;
int lineLength = 79 - indentLength;
const char * help = opt->descrip;
int helpLength;
const char * ch;
char format[10];
char * left = alloca(maxLeftCol + 1);
*left = '\0';
if (opt->longName && opt->shortName)
sprintf(left, "-%c, --%s", opt->shortName, opt->longName);
else if (opt->shortName)
sprintf(left, "-%c", opt->shortName);
else if (opt->longName)
sprintf(left, "--%s", opt->longName);
if (!*left) return ;
if (opt->argDescrip) {
strcat(left, "=");
strcat(left, opt->argDescrip);
}
if (help)
fprintf(f," %-*s ", maxLeftCol, left);
else {
fprintf(f," %s\n", left);
return;
}
helpLength = strlen(help);
while (helpLength > lineLength) {
ch = help + lineLength - 1;
while (ch > help && !isspace(*ch)) ch--;
if (ch == help) break; /* give up */
while (ch > (help + 1) && isspace(*ch)) ch--;
ch++;
sprintf(format, "%%.%ds\n%%%ds", (int) (ch - help), indentLength);
fprintf(f, format, help, " ");
help = ch;
while (isspace(*help) && *help) help++;
helpLength = strlen(help);
}
if (helpLength) fprintf(f, "%s\n", help);
}
static int maxArgWidth(const struct poptOption * opt) {
int max = 0;
int this;
while (opt->longName || opt->shortName || opt->arg) {
if (opt->argInfo == POPT_ARG_INCLUDE_TABLE) {
this = maxArgWidth(opt->arg);
} else {
this = opt->shortName ? 2 : 0;
if (opt->longName) {
if (this) this += 2;
this += strlen(opt->longName) + 2;
}
if (opt->argDescrip)
this += strlen(opt->argDescrip) + 1;
}
if (this > max) max = this;
opt++;
}
return max;
}
static void singleTableHelp(FILE * f, const struct poptOption * table,
int left) {
const struct poptOption * opt;
opt = table;
while (opt->longName || opt->shortName || opt->arg) {
if (opt->longName || opt->shortName)
singleOptionHelp(f, left, opt);
opt++;
}
opt = table;
while (opt->longName || opt->shortName || opt->arg) {
if (opt->argInfo == POPT_ARG_INCLUDE_TABLE) {
if (opt->descrip)
fprintf(f, "\n%s\n", opt->descrip);
singleTableHelp(f, opt->arg, left);
}
opt++;
}
}
static int showHelpIntro(poptContext con, FILE * f) {
int len = 6;
char * fn;
fprintf(f, "Usage:");
if (!(con->flags & POPT_CONTEXT_KEEP_FIRST)) {
fn = con->optionStack->argv[0];
if (strchr(fn, '/')) fn = strchr(fn, '/') + 1;
fprintf(f, " %s", fn);
len += strlen(fn) + 1;
}
return len;
}
void poptPrintHelp(poptContext con, FILE * f, int flags) {
int leftColWidth;
showHelpIntro(con, f);
if (con->otherHelp)
fprintf(f, " %s\n", con->otherHelp);
else
fprintf(f, " [OPTION...]\n");
leftColWidth = maxArgWidth(con->options);
singleTableHelp(f, con->options, leftColWidth);
}
static int singleOptionUsage(FILE * f, int cursor,
const struct poptOption * opt) {
int len = 3;
char shortStr[2];
const char * item = shortStr;
if (opt->shortName) {
if (!opt->argInfo) return cursor; /* we did these already */
len++;
*shortStr = opt->shortName;
shortStr[1] = '\0';
} else if (opt->longName) {
len += 1 + strlen(opt->longName);
item = opt->longName;
}
if (len == 3) return cursor;
if (opt->argDescrip)
len += strlen(opt->argDescrip) + 1;
if ((cursor + len) > 79) {
fprintf(f, "\n ");
cursor = 7;
}
fprintf(f, " [-%s%s%s%s]", opt->shortName ? "" : "-", item,
opt->argDescrip ? "=" : "",
opt->argDescrip ? opt->argDescrip : "");
return cursor + len + 1;
}
int singleTableUsage(FILE * f, int cursor, const struct poptOption * table) {
const struct poptOption * opt;
opt = table;
while (opt->longName || opt->shortName || opt->arg) {
if (opt->longName || opt->shortName)
cursor = singleOptionUsage(f, cursor, opt);
else if (opt->argInfo == POPT_ARG_INCLUDE_TABLE)
cursor = singleTableUsage(f, cursor, opt->arg);
opt++;
}
return cursor;
}
static int showShortOptions(const struct poptOption * opt, FILE * f,
char * str) {
char s[300]; /* this is larger then the ascii set, so
it should do just fine */
if (!str) {
str = s;
memset(str, 0, sizeof(str));
}
while (opt->longName || opt->shortName || opt->arg) {
if (opt->shortName && !opt->argInfo)
str[strlen(str)] = opt->shortName;
else if (opt->argInfo == POPT_ARG_INCLUDE_TABLE)
showShortOptions(opt->arg, f, str);
opt++;
}
if (s != str || !*s)
return 0;
fprintf(f, " [-%s]", s);
return strlen(s) + 4;
}
void poptPrintUsage(poptContext con, FILE * f, int flags) {
int cursor;
cursor = showHelpIntro(con, f);
cursor += showShortOptions(con->options, f, NULL);
singleTableUsage(f, cursor, con->options);
if (con->otherHelp) {
cursor += strlen(con->otherHelp) + 1;
if (cursor > 79) fprintf(f, "\n ");
fprintf(f, " %s", con->otherHelp);
}
fprintf(f, "\n");
}
void poptSetOtherOptionHelp(poptContext con, const char * text) {
if (con->otherHelp) free(con->otherHelp);
con->otherHelp = strdup(text);
}
|
