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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Each informative line has 6 spaces,
a quote, then the data type, then a quote,
then a colon, then a space, then a quote,
then the data, terminated by a quote.
The length of the data type's name plus
11 characters precedes the data on each line. */
#define PREFIX 11
void
stripquote(char *str)
{
int i;
for (i = 0; str[i] != '\0'; ++i)
if (str[i] == '"') {
str[i] = '\0';
break;
}
}
int
dircmp(char *dir, char *str)
{
int slashes = 0, i;
for (i = 0; str[i] != '\0'; ++i)
if (str[i] == '/')
++slashes;
if (dir == NULL) {
if (! slashes)
return 1;
return 0;
}
int diff = 0, dirslashes = 0, dirlen = 0;
for (i = 0; dir[i] != '\0'; ++i) {
if (dir[i] != str[i]) {
diff = 1;
break;
}
if (dir[i] == '/')
++dirslashes;
++dirlen;
}
if (diff)
return 0;
/* Account for a trailing slash. */
if (dir[dirlen - 1] == '/')
--dirslashes;
if (slashes - dirslashes < 2)
return 1;
return 0;
}
void
printentry(int long_format, int size, char *path, int is_directory,
char *sha1_hash, char *updated_at)
{
if (long_format) {
/* The longest 31-bit int is 10 digits.
If the file size is larger, there's worse problems. */
printf("%10d ", size);
int i;
for (i = 0; i < 20; ++i)
putchar(updated_at[5 + i]);
putchar(' ');
}
printf("%s", path);
if (is_directory)
putchar('/');
putchar('\n');
}
char *infn = "files.json";
/* neols [-l] [wildcard] */
int
main(int argc, char **argv)
{
FILE *in = fopen(infn, "r");
if (in == NULL) {
puts("files.json isn't in the working directory.");
return 1;
}
int i;
int long_format = 0;
char *dir = NULL;
for (i = 1; i < argc; ++i) {
if (strcmp(argv[i], "-l") == 0)
long_format = 1;
else
dir = argv[i];
}
char *line = NULL;
/* The various statistics related to each entry are stored,
one entry at a time. A path may be any size, so each line need
be handled by realloc. */
char *path = NULL, *updated_at = NULL, *sha1_hash = NULL;
int is_directory = 0, size = 0;
int len;
unsigned long line_size = 0;
while ((len = getline(&line, &line_size, in)) > 0) {
/* Only on lines terminating an entry, '}' is the
fifth character. The ninth character of each data
line is unique. */
if (line[4] == '}') {
char *p = path + PREFIX + strlen("size");
if (dircmp(dir, p)) {
printentry(long_format, size, p,
is_directory, sha1_hash + PREFIX
+ strlen("sha1_hash"),
updated_at + PREFIX +
strlen("updated_at"));
}
free(path);
free(updated_at);
free(sha1_hash);
sha1_hash = NULL;
size = 0;
free(line);
} else if (line[8] == 'a') {
path = line;
stripquote(path + strlen("path") + PREFIX);
} else if (line[8] == 's') {
if (strstr(line, "false") != NULL)
is_directory = 0;
else
is_directory = 1;
free(line);
} else if (line[8] == 'i') {
line[len - 1] = '\0';
size = atoi(line + PREFIX + strlen("size"));
free(line);
} else if (line[8] == 'p') {
updated_at = line;
stripquote(updated_at);
} else if (line[8] == 'h') {
sha1_hash = line;
}
line = NULL;
}
return 0;
}
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