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utils.c
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utils.c
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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <err.h>
#include "version.h"
#include "utils.h"
const char *adjust_unit(double *ptr_bytes)
{
const char *units[] = { "Byte", "KB", "MB", "GB", "TB", "PB", "EB" };
int i = 0;
double final = *ptr_bytes;
while (i < 7 && final >= 1024) {
final /= 1024;
i++;
}
*ptr_bytes = final;
return units[i];
}
int is_my_file(const char *filename)
{
const char *p = filename;
if (!p || !isdigit(*p))
return 0;
/* Skip digits. */
do {
p++;
} while (isdigit(*p));
return (p[0] == '.') && (p[1] == 'h') && (p[2] == '2') &&
(p[3] == 'w') && (p[4] == '\0');
}
char *full_fn_from_number(const char **filename, const char *path, long num)
{
char *str;
assert(asprintf(&str, "%s/%li.h2w", path, num + 1) > 0);
*filename = str + strlen(path) + 1;
return str;
}
/* Parse @param and return the start-at parameter.
* The string must be of the format "--start-at=NUM"; otherwise it returns -1.
*/
#define START_AT_TEXT "--start-at="
#define END_AT_TEXT "--end-at="
static inline int is_param(const char *text, const char *param)
{
return !strncmp(param, text, strlen(text));
}
static long parse_long_param(const char *param)
{
char *endptr;
long value;
/* Skip text. */
while (*param != '=') {
if (*param == '\0')
return -1;
param++;
}
param++; /* Skip '='. */
value = strtol(param, &endptr, 10);
if (*endptr != '\0')
return -1;
return (value <= 0 || value == LONG_MAX) ? -1 : value - 1;
}
static int parse_param(const char *param, long *pstart_at, long *pend_at)
{
if (is_param(START_AT_TEXT, param))
*pstart_at = parse_long_param(param);
else if (is_param(END_AT_TEXT, param))
*pend_at = parse_long_param(param);
else
return 1;
return 0;
}
int parse_args(const char *name, int argc, char **argv,
long *pstart_at, long *pend_at, const char **ppath)
{
*pstart_at = 0;
*pend_at = LONG_MAX - 1;
switch (argc) {
case 2:
*ppath = argv[1];
break;
case 3:
if (parse_param(argv[1], pstart_at, pend_at))
goto error;
*ppath = argv[2];
break;
case 4:
if (parse_param(argv[1], pstart_at, pend_at))
goto error;
if (parse_param(argv[2], pstart_at, pend_at))
goto error;
*ppath = argv[3];
break;
default:
goto error;
}
if (*pstart_at >= 0 && *pend_at >= 0 && *pstart_at <= *pend_at)
return 0;
error:
print_header(stderr, name);
fprintf(stderr, "Usage: f3%s [%sNUM] [%sNUM] <PATH>\n",
name, START_AT_TEXT, END_AT_TEXT);
return 1;
}
static long number_from_filename(const char *filename)
{
const char *p;
long num;
assert(is_my_file(filename));
p = filename;
num = 0;
do {
num = num * 10 + (*p - '0');
p++;
} while (isdigit(*p));
return num - 1;
}
/* Don't call this function directly, use ls_my_files() instead. */
static long *__ls_my_files(DIR *dir, long start_at, long end_at,
int *pcount, int *pindex)
{
struct dirent *entry;
const char *filename;
long number, *ret;
int my_index;
entry = readdir(dir);
if (!entry) {
ret = malloc(sizeof(long) * (*pcount + 1));
assert(ret);
*pindex = *pcount - 1;
ret[*pcount] = -1;
closedir(dir);
return ret;
}
filename = entry->d_name;
if (!is_my_file(filename))
return __ls_my_files(dir, start_at, end_at, pcount, pindex);
/* Cache @number because @entry may go away. */
number = number_from_filename(filename);
/* Ignore files before @start_at and after @end_at. */
if (number < start_at || end_at < number)
return __ls_my_files(dir, start_at, end_at, pcount, pindex);
(*pcount)++;
ret = __ls_my_files(dir, start_at, end_at, pcount, &my_index);
ret[my_index] = number;
*pindex = my_index - 1;
return ret;
}
/* To be used with qsort(3). */
static int cmpintp(const void *p1, const void *p2)
{
return *(const long *)p1 - *(const long *)p2;
}
const long *ls_my_files(const char *path, long start_at, long end_at)
{
DIR *dir = opendir(path);
int my_count;
int my_index;
long *ret;
if (!dir)
err(errno, "Can't open path %s", path);
my_count = 0;
ret = __ls_my_files(dir, start_at, end_at, &my_count, &my_index);
assert(my_index == -1);
qsort(ret, my_count, sizeof(*ret), cmpintp);
return ret;
}
void print_header(FILE *f, const char *name)
{
fprintf(f,
"F3 %s " F3_STR_VERSION "\n"
"Copyright (C) 2010 Digirati Internet LTDA.\n"
"This is free software; see the source for copying conditions.\n"
"\n", name);
}