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
|
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>
#define optstr "0h:L:r:"
typedef struct {
const char *hash;
const char *repository;
unsigned hash_max_lines;
char **files;
unsigned n_files;
char input_sep;
} options_t;
static void usage(const char *prgname)
{
errx(EX_USAGE, "usage %s ...", prgname);
}
static int str_to_uint(const char *str, unsigned *out)
{
unsigned long result;
char *end;
errno = 0;
result = strtoul(str, &end, 10);
if (errno)
goto fail;
if (*end != '\0') {
errno = EINVAL;
goto fail;
}
if (result > UINT_MAX) {
errno = ERANGE;
goto fail;
}
*out = result;
return 0;
fail:
warn("str_to_uint \"%s\"", str);
return -1;
}
static options_t read_opts(int argc, char **argv)
{
int o;
const char *prgname;
options_t options = {
.hash = "md5sum",
.repository = ".",
.hash_max_lines = 4096,
.input_sep = '\n',
};
prgname = argc < 1 ? "keep" : argv[0];
while (o = getopt(argc, argv, optstr), o != -1) {
switch (o) {
case '0':
options.input_sep = '\0';
break;
case 'h':
options.hash = optarg;
break;
case 'L':
if (str_to_uint(optarg, &options.hash_max_lines))
goto fail;
break;
case 'r':
options.repository = optarg;
break;
case '?':
default:
usage(prgname);
}
}
options.files = argv + optind;
options.n_files = argc - optind;
return options;
fail:
err(EX_CONFIG, "bad options");
}
static const char *iter_files(const options_t *opts, void **aux)
{
struct ctx {
enum {
from_files_list,
from_stdin,
} from;
union {
struct {
int next;
} files_list;
struct {
char *line;
size_t len;
} stdin;
};
};
struct ctx *ctx = *aux;
ssize_t nread;
if (!ctx) { /* initialization */
*aux = ctx = malloc(sizeof(struct ctx));
if (!ctx)
err(EX_OSERR, "malloc");
*ctx = (struct ctx){
opts->n_files ? from_files_list : from_stdin
};
}
switch (ctx->from) {
case from_stdin:
errno = 0;
nread = getdelim(
&ctx->stdin.line,
&ctx->stdin.len,
opts->input_sep,
stdin
);
if (nread == -1) {
if (!errno) {
free(ctx->stdin.line);
goto done;
}
err(EX_OSERR, "getdelim(..., stdin)");
}
if (opts->input_sep && ctx->stdin.line[nread - 1] == opts->input_sep)
ctx->stdin.line[nread - 1] = '\0';
return ctx->stdin.line;
case from_files_list:
if (ctx->files_list.next >= opts->n_files)
goto done;
return opts->files[ctx->files_list.next++];
}
err(EX_SOFTWARE, __FILE__":%d - buggy", __LINE__);
done:
free(*aux);
*aux = NULL;
return NULL;
}
static int run(const options_t *opts)
{
void *aux = NULL;
const char *file;
while (file = iter_files(opts, &aux), file)
warnx("[%s]", file);
return 0;
}
int main(int argc, char **argv)
{
options_t opts;
opts = read_opts(argc, argv);
return run(&opts);
}
|