]>
Commit | Line | Data |
---|---|---|
92658f56 PR |
1 | #include <errno.h> |
2 | #include <stdio.h> | |
3 | #include <malloc.h> | |
4 | #include <string.h> | |
aac236f4 | 5 | #include <assert.h> |
4fcbeed6 | 6 | #include "daemon-shared.h" |
92658f56 PR |
7 | |
8 | /* | |
9 | * Read a single message from a (socket) filedescriptor. Messages are delimited | |
10 | * by blank lines. This call will block until all of a message is received. The | |
11 | * memory will be allocated from heap. Upon error, all memory is freed and the | |
12 | * buffer pointer is set to NULL. | |
4fcbeed6 PR |
13 | * |
14 | * See also write_buffer about blocking (read_buffer has identical behaviour). | |
92658f56 PR |
15 | */ |
16 | int read_buffer(int fd, char **buffer) { | |
17 | int bytes = 0; | |
18 | int buffersize = 32; | |
19 | *buffer = malloc(buffersize + 1); | |
20 | ||
21 | while (1) { | |
22 | int result = read(fd, (*buffer) + bytes, buffersize - bytes); | |
23 | if (result > 0) | |
24 | bytes += result; | |
25 | if (result == 0) | |
26 | goto fail; /* we should never encounter EOF here */ | |
27 | if (result < 0 && errno != EAGAIN && errno != EWOULDBLOCK) | |
28 | goto fail; | |
29 | ||
30 | if (bytes == buffersize) { | |
31 | buffersize += 1024; | |
32 | char *new = realloc(*buffer, buffersize + 1); | |
33 | if (new) | |
34 | *buffer = new; | |
35 | else | |
36 | goto fail; | |
37 | } else { | |
38 | (*buffer)[bytes] = 0; | |
39 | char *end; | |
40 | if ((end = strstr((*buffer) + bytes - 2, "\n\n"))) { | |
41 | *end = 0; | |
42 | break; /* success, we have the full message now */ | |
43 | } | |
44 | /* TODO call select here if we encountered EAGAIN/EWOULDBLOCK */ | |
45 | } | |
46 | } | |
47 | return 1; | |
48 | fail: | |
49 | free(*buffer); | |
50 | *buffer = NULL; | |
51 | return 0; | |
52 | } | |
53 | ||
54 | /* | |
55 | * Write a buffer to a filedescriptor. Keep trying. Blocks (even on | |
56 | * SOCK_NONBLOCK) until all of the write went through. | |
57 | * | |
58 | * TODO use select on EWOULDBLOCK/EAGAIN to avoid useless spinning | |
59 | */ | |
60 | int write_buffer(int fd, char *buffer, int length) { | |
61 | int written = 0; | |
62 | while (1) { | |
63 | int result = write(fd, buffer + written, length - written); | |
64 | if (result > 0) | |
65 | written += result; | |
66 | if (result < 0 && errno != EWOULDBLOCK && errno != EAGAIN) | |
67 | break; /* too bad */ | |
68 | if (written == length) | |
69 | return 1; /* done */ | |
70 | } | |
71 | return 0; | |
72 | } | |
4fcbeed6 | 73 | |
14e01287 | 74 | char *format_buffer(const char *what, const char *id, va_list ap) |
4fcbeed6 PR |
75 | { |
76 | char *buffer, *old; | |
77 | char *next; | |
aac236f4 | 78 | int keylen; |
4fcbeed6 | 79 | |
14e01287 | 80 | dm_asprintf(&buffer, "%s = \"%s\"\n", what, id); |
4fcbeed6 PR |
81 | if (!buffer) goto fail; |
82 | ||
83 | while (next = va_arg(ap, char *)) { | |
84 | old = buffer; | |
aac236f4 PR |
85 | assert(strchr(next, '=')); |
86 | keylen = strchr(next, '=') - next; | |
87 | if (strstr(next, "%d")) { | |
88 | int value = va_arg(ap, int); | |
89 | dm_asprintf(&buffer, "%s%.*s= %d\n", buffer, keylen, next, value); | |
90 | dm_free(old); | |
91 | } else if (strstr(next, "%s")) { | |
92 | char *value = va_arg(ap, char *); | |
93 | dm_asprintf(&buffer, "%s%.*s= \"%s\"\n", buffer, keylen, next, value); | |
94 | dm_free(old); | |
95 | } else if (strstr(next, "%b")) { | |
96 | char *block = va_arg(ap, char *); | |
97 | if (!block) | |
98 | continue; | |
99 | dm_asprintf(&buffer, "%s%.*s%s", buffer, keylen, next, block); | |
4fcbeed6 | 100 | dm_free(old); |
4fcbeed6 PR |
101 | } else { |
102 | dm_asprintf(&buffer, "%s%s", buffer, next); | |
103 | dm_free(old); | |
4fcbeed6 | 104 | } |
aac236f4 | 105 | if (!buffer) goto fail; |
4fcbeed6 PR |
106 | } |
107 | ||
108 | old = buffer; | |
109 | dm_asprintf(&buffer, "%s\n", buffer); | |
110 | dm_free(old); | |
111 | ||
112 | return buffer; | |
113 | fail: | |
114 | dm_free(buffer); | |
115 | return NULL; | |
116 | } |