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
|
/* This file is part of GDBM, the GNU data base manager.
Copyright (C) 2024-2025 Free Software Foundation, Inc.
GDBM is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GDBM is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GDBM. If not, see <http://www.gnu.org/licenses/>. */
#include "autoconf.h"
#include <stdio.h>
#include <stdarg.h>
#include "gdbmtool.h"
int
pager_flush (struct pagerfile *pfp)
{
if (pfp->bufsize > 0)
{
if (fwrite (pfp->bufbase, pfp->bufsize, 1, pfp->stream) != 1)
return -1;
pfp->bufsize = 0;
}
if (fflush (pfp->stream))
return -1;
return 0;
}
static int
pager_checklines (struct pagerfile *pfp)
{
if (pfp->nlines > pfp->maxlines)
{
FILE *pagfp = popen (pfp->pager, "w");
if (!pagfp)
{
terror (_("cannot run pager `%s': %s"), pfp->pager, strerror (errno));
pfp->mode = mode_transparent;
}
else
{
pfp->mode = mode_pager;
pfp->stream = pagfp;
}
return pager_flush (pfp);
}
return 0;
}
static ssize_t
memccount (char const *str, int c, size_t len)
{
ssize_t n = 0;
for (; len > 0; len--, str++)
if (*str == c)
n++;
return n;
}
ssize_t
pager_write (struct pagerfile *pfp, const char *buffer, size_t size)
{
if (pfp->mode != mode_initial)
{
return fwrite (buffer, 1, size, pfp->stream);
}
while (pfp->bufsize + size > pfp->bufmax)
pfp->bufbase = e2nrealloc (pfp->bufbase, &pfp->bufmax, 1);
memcpy (pfp->bufbase + pfp->bufsize, buffer, size);
pfp->bufsize += size;
pfp->nlines += memccount (buffer, '\n', size);
if (pager_checklines (pfp))
return -1;
return size;
}
ssize_t
pager_writez (struct pagerfile *pfp, const char *str)
{
return pager_write (pfp, str, strlen (str));
}
int
pager_putc (struct pagerfile *pfp, int c)
{
char buf[1];
buf[0] = c;
return pager_write (pfp, buf, 1);
}
ssize_t
pager_writeln (struct pagerfile *pfp, const char *str)
{
ssize_t ret = pager_writez (pfp, str);
if (ret > 0)
{
if (pager_write (pfp, "\n", 1) == 1)
ret++;
}
return ret;
}
int
pager_vprintf (struct pagerfile *pfp, const char *fmt, va_list ap)
{
ssize_t ret;
if (!pfp->bufbase)
{
if (pfp->bufmax == 0)
pfp->bufmax = 512;
pfp->bufbase = ecalloc (1, pfp->bufmax);
}
for (;;)
{
va_list aq;
ssize_t n;
char *bufptr = pfp->bufbase + pfp->bufsize;
size_t buflen = pfp->bufmax - pfp->bufsize;
va_copy (aq, ap);
n = vsnprintf (bufptr, buflen, fmt, aq);
va_end (aq);
if (n < 0 || n >= buflen || !memchr (bufptr, '\0', n + 1))
{
pfp->bufbase = e2nrealloc (pfp->bufbase, &pfp->bufmax, 1);
}
else
{
if (pfp->mode == mode_initial)
pfp->nlines += memccount (bufptr, '\n', n);
ret = n;
pfp->bufsize += n;
break;
}
}
if (pfp->mode == mode_initial)
ret = pager_checklines (pfp);
else
ret = pager_flush (pfp);
return ret;
}
int
pager_printf (struct pagerfile *pfp, const char *fmt, ...)
{
va_list ap;
int ret;
va_start (ap, fmt);
ret = pager_vprintf (pfp, fmt, ap);
va_end (ap);
return ret;
}
void
pager_close (struct pagerfile *pfp)
{
if (pfp->bufsize)
pager_flush (pfp);
if (pfp->mode == mode_pager)
pclose (pfp->stream);
free (pfp->bufbase);
free (pfp->pager);
free (pfp);
}
int
pager_error (struct pagerfile *pfp)
{
return ferror (pfp->stream);
}
PAGERFILE *
pager_open (FILE *stream, size_t maxlines, char const *pager)
{
struct pagerfile *pfp;
pfp = ecalloc (1, sizeof (*pfp));
pfp->stream = stream;
if (maxlines > 0 && pager)
{
pfp->pager = estrdup (pager);
pfp->mode = mode_initial;
pfp->maxlines = maxlines;
}
else
pfp->mode = mode_transparent;
return pfp;
}
PAGERFILE *
pager_create (char const *pager)
{
struct pagerfile *pfp;
FILE *pagfp = popen (pager, "w");
if (!pagfp)
{
terror (_("cannot run command `%s': %s"), pager, strerror (errno));
return NULL;
}
pfp = ecalloc (1, sizeof (*pfp));
pfp->pager = estrdup (pager);
pfp->mode = mode_pager;
pfp->stream = pagfp;
return pfp;
}
|
