Merge branch 'maint'
[alt-git.git] / vcs-svn / line_buffer.c
blob1543567093fad603e09ba61b2fc47ec232b4cae2
1 /*
2 * Licensed under a two-clause BSD-style license.
3 * See LICENSE for details.
4 */
6 #include "git-compat-util.h"
7 #include "line_buffer.h"
8 #include "obj_pool.h"
10 #define LINE_BUFFER_LEN 10000
11 #define COPY_BUFFER_LEN 4096
13 /* Create memory pool for char sequence of known length */
14 obj_pool_gen(blob, char, 4096)
16 static char line_buffer[LINE_BUFFER_LEN];
17 static char byte_buffer[COPY_BUFFER_LEN];
18 static FILE *infile;
20 int buffer_init(const char *filename)
22 infile = filename ? fopen(filename, "r") : stdin;
23 if (!infile)
24 return -1;
25 return 0;
28 int buffer_deinit(void)
30 int err;
31 if (infile == stdin)
32 return ferror(infile);
33 err = ferror(infile);
34 err |= fclose(infile);
35 return err;
38 /* Read a line without trailing newline. */
39 char *buffer_read_line(void)
41 char *end;
42 if (!fgets(line_buffer, sizeof(line_buffer), infile))
43 /* Error or data exhausted. */
44 return NULL;
45 end = line_buffer + strlen(line_buffer);
46 if (end[-1] == '\n')
47 end[-1] = '\0';
48 else if (feof(infile))
49 ; /* No newline at end of file. That's fine. */
50 else
52 * Line was too long.
53 * There is probably a saner way to deal with this,
54 * but for now let's return an error.
56 return NULL;
57 return line_buffer;
60 char *buffer_read_string(uint32_t len)
62 char *s;
63 blob_free(blob_pool.size);
64 s = blob_pointer(blob_alloc(len + 1));
65 s[fread(s, 1, len, infile)] = '\0';
66 return ferror(infile) ? NULL : s;
69 void buffer_copy_bytes(uint32_t len)
71 uint32_t in;
72 while (len > 0 && !feof(infile) && !ferror(infile)) {
73 in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN;
74 in = fread(byte_buffer, 1, in, infile);
75 len -= in;
76 fwrite(byte_buffer, 1, in, stdout);
77 if (ferror(stdout)) {
78 buffer_skip_bytes(len);
79 return;
84 void buffer_skip_bytes(uint32_t len)
86 uint32_t in;
87 while (len > 0 && !feof(infile) && !ferror(infile)) {
88 in = len < COPY_BUFFER_LEN ? len : COPY_BUFFER_LEN;
89 in = fread(byte_buffer, 1, in, infile);
90 len -= in;
94 void buffer_reset(void)
96 blob_reset();