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proc_parse.c
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#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <sys/stat.h>
#include <string.h>
#include <linux/fs.h>
#include "asm/types.h"
#include "list.h"
#include "util.h"
#include "mount.h"
#include "mman.h"
#include "cpu.h"
#include "file-lock.h"
#include "pstree.h"
#include "fsnotify.h"
#include "posix-timer.h"
#include "kerndat.h"
#include "vdso.h"
#include "vma.h"
#include "proc_parse.h"
#include "protobuf.h"
#include "protobuf/fdinfo.pb-c.h"
#include <stdlib.h>
struct buffer {
char buf[PAGE_SIZE];
char end; /* '\0' */
};
static struct buffer __buf;
static char *buf = __buf.buf;
#define BUF_SIZE sizeof(__buf.buf)
int parse_cpuinfo_features(int (*handler)(char *tok))
{
FILE *cpuinfo;
cpuinfo = fopen("/proc/cpuinfo", "r");
if (!cpuinfo) {
pr_perror("Can't open cpuinfo file");
return -1;
}
while (fgets(buf, BUF_SIZE, cpuinfo)) {
char *tok;
if (strncmp(buf, "flags\t\t:", 8))
continue;
for (tok = strtok(buf, " \t\n"); tok;
tok = strtok(NULL, " \t\n")) {
if (handler(tok) < 0)
break;
}
}
fclose(cpuinfo);
return 0;
}
/* check the @line starts with "%lx-%lx" format */
static bool is_vma_range_fmt(char *line)
{
#define ____is_vma_addr_char(__c) \
(((__c) <= '9' && (__c) >= '0') || \
((__c) <= 'f' && (__c) >= 'a'))
while (*line && ____is_vma_addr_char(*line))
line++;
if (*line++ != '-')
return false;
while (*line && ____is_vma_addr_char(*line))
line++;
if (*line++ != ' ')
return false;
return true;
#undef ____is_vma_addr_char
}
static int parse_vmflags(char *buf, struct vma_area *vma_area)
{
char *tok;
bool shared = false;
bool maywrite = false;
if (!buf[0])
return 0;
tok = strtok(buf, " \n");
if (!tok)
return 0;
#define _vmflag_match(_t, _s) (_t[0] == _s[0] && _t[1] == _s[1])
do {
/* open() block */
if (_vmflag_match(tok, "sh"))
shared = true;
else if (_vmflag_match(tok, "mw"))
maywrite = true;
/* mmap() block */
if (_vmflag_match(tok, "gd"))
vma_area->e->flags |= MAP_GROWSDOWN;
else if (_vmflag_match(tok, "lo"))
vma_area->e->flags |= MAP_LOCKED;
else if (_vmflag_match(tok, "nr"))
vma_area->e->flags |= MAP_NORESERVE;
else if (_vmflag_match(tok, "ht"))
vma_area->e->flags |= MAP_HUGETLB;
/* madvise() block */
if (_vmflag_match(tok, "sr"))
vma_area->e->madv |= (1ul << MADV_SEQUENTIAL);
else if (_vmflag_match(tok, "rr"))
vma_area->e->madv |= (1ul << MADV_RANDOM);
else if (_vmflag_match(tok, "dc"))
vma_area->e->madv |= (1ul << MADV_DONTFORK);
else if (_vmflag_match(tok, "dd"))
vma_area->e->madv |= (1ul << MADV_DONTDUMP);
else if (_vmflag_match(tok, "mg"))
vma_area->e->madv |= (1ul << MADV_MERGEABLE);
else if (_vmflag_match(tok, "hg"))
vma_area->e->madv |= (1ul << MADV_HUGEPAGE);
else if (_vmflag_match(tok, "nh"))
vma_area->e->madv |= (1ul << MADV_NOHUGEPAGE);
/*
* Anything else is just ignored.
*/
} while ((tok = strtok(NULL, " \n")));
#undef _vmflag_match
if (shared && maywrite)
vma_area->e->fdflags = O_RDWR;
else
vma_area->e->fdflags = O_RDONLY;
vma_area->e->has_fdflags = true;
if (vma_area->e->madv)
vma_area->e->has_madv = true;
return 0;
}
static inline int is_anon_shmem_map(dev_t dev)
{
return kerndat_shmem_dev == dev;
}
struct vma_file_info {
int dev_maj;
int dev_min;
unsigned long ino;
struct vma_area *vma;
};
static inline int vfi_equal(struct vma_file_info *a, struct vma_file_info *b)
{
return ((a->ino ^ b->ino) |
(a->dev_maj ^ b->dev_maj) |
(a->dev_min ^ b->dev_min)) == 0;
}
static int vma_get_mapfile(struct vma_area *vma, DIR *mfd,
struct vma_file_info *vfi, struct vma_file_info *prev_vfi)
{
char path[32];
if (!mfd)
return 0;
if (prev_vfi->vma && vfi_equal(vfi, prev_vfi)) {
struct vma_area *prev = prev_vfi->vma;
/*
* If vfi is equal (!) and negative @vm_file_fd --
* we have nothing to borrow for sure.
*/
if (prev->vm_file_fd < 0)
return 0;
pr_debug("vma %"PRIx64" borrows vfi from previous %"PRIx64"\n",
vma->e->start, prev->e->start);
vma->vm_file_fd = prev->vm_file_fd;
if (prev->e->status & VMA_AREA_SOCKET)
vma->e->status |= VMA_AREA_SOCKET | VMA_AREA_REGULAR;
vma->file_borrowed = true;
return 0;
}
/* Figure out if it's file mapping */
snprintf(path, sizeof(path), "%"PRIx64"-%"PRIx64, vma->e->start, vma->e->end);
/*
* Note that we "open" it in dumper process space
* so later we might refer to it via /proc/self/fd/vm_file_fd
* if needed.
*/
vma->vm_file_fd = openat(dirfd(mfd), path, O_RDONLY);
if (vma->vm_file_fd < 0) {
if (errno == ENXIO) {
struct stat buf;
if (fstatat(dirfd(mfd), path, &buf, 0))
return -1;
if (!S_ISSOCK(buf.st_mode))
return -1;
pr_info("Found socket %"PRIu64" mapping @%"PRIx64"\n",
buf.st_ino, vma->e->start);
vma->e->status |= VMA_AREA_SOCKET | VMA_AREA_REGULAR;
vma->vm_socket_id = buf.st_ino;
} else if (errno != ENOENT)
return -1;
}
return 0;
}
int parse_self_maps_lite(struct vm_area_list *vms)
{
FILE *maps;
vm_area_list_init(vms);
maps = fopen("/proc/self/maps", "r");
if (maps == NULL) {
pr_perror("Can't open self maps");
return -1;
}
while (fgets(buf, BUF_SIZE, maps) != NULL) {
struct vma_area *vma;
char *end;
vma = alloc_vma_area();
if (!vma) {
fclose(maps);
return -1;
}
vma->e->start = strtoul(buf, &end, 16);
vma->e->end = strtoul(end + 1, NULL, 16);
list_add_tail(&vma->list, &vms->h);
vms->nr++;
pr_debug("Parsed %"PRIx64"-%"PRIx64" vma\n", vma->e->start, vma->e->end);
}
fclose(maps);
return 0;
}
static char smaps_buf[PAGE_SIZE];
int parse_smaps(pid_t pid, struct vm_area_list *vma_area_list, bool use_map_files)
{
struct vma_area *vma_area = NULL;
unsigned long start, end, pgoff, prev_end = 0;
char r, w, x, s;
int ret = -1;
struct vma_file_info vfi;
struct vma_file_info prev_vfi = {};
DIR *map_files_dir = NULL;
FILE *smaps = NULL;
vma_area_list->nr = 0;
vma_area_list->longest = 0;
vma_area_list->priv_size = 0;
INIT_LIST_HEAD(&vma_area_list->h);
smaps = fopen_proc(pid, "smaps");
if (!smaps)
goto err;
setvbuf(smaps, smaps_buf, _IOFBF, sizeof(smaps_buf));
if (use_map_files) {
map_files_dir = opendir_proc(pid, "map_files");
if (!map_files_dir) /* old kernel? */
goto err;
}
while (1) {
int num;
char file_path[6];
bool eof;
eof = (fgets(buf, BUF_SIZE, smaps) == NULL);
if (!eof && !is_vma_range_fmt(buf)) {
if (!strncmp(buf, "Nonlinear", 9)) {
BUG_ON(!vma_area);
pr_err("Nonlinear mapping found %016"PRIx64"-%016"PRIx64"\n",
vma_area->e->start, vma_area->e->end);
/*
* VMA is already on list and will be
* freed later as list get destroyed.
*/
vma_area = NULL;
goto err;
} else if (!strncmp(buf, "VmFlags: ", 9)) {
BUG_ON(!vma_area);
if (parse_vmflags(&buf[9], vma_area))
goto err;
continue;
} else
continue;
}
if (vma_area) {
/* Add a guard page only if here is enough space for it */
if ((vma_area->e->flags & MAP_GROWSDOWN) &&
prev_end < vma_area->e->start)
vma_area->e->start -= PAGE_SIZE; /* Guard page */
prev_end = vma_area->e->end;
list_add_tail(&vma_area->list, &vma_area_list->h);
vma_area_list->nr++;
if (privately_dump_vma(vma_area)) {
unsigned long pages;
pages = vma_area_len(vma_area) / PAGE_SIZE;
vma_area_list->priv_size += pages;
vma_area_list->longest = max(vma_area_list->longest, pages);
}
prev_vfi = vfi;
prev_vfi.vma = vma_area;
}
if (eof)
break;
vma_area = alloc_vma_area();
if (!vma_area)
goto err;
memset(file_path, 0, 6);
num = sscanf(buf, "%lx-%lx %c%c%c%c %lx %x:%x %lu %5s",
&start, &end, &r, &w, &x, &s, &pgoff,
&vfi.dev_maj, &vfi.dev_min, &vfi.ino, file_path);
if (num < 10) {
pr_err("Can't parse: %s\n", buf);
goto err;
}
vma_area->e->start = start;
vma_area->e->end = end;
vma_area->e->pgoff = pgoff;
vma_area->e->prot = PROT_NONE;
if (vma_get_mapfile(vma_area, map_files_dir, &vfi, &prev_vfi))
goto err_bogus_mapfile;
if (r == 'r')
vma_area->e->prot |= PROT_READ;
if (w == 'w')
vma_area->e->prot |= PROT_WRITE;
if (x == 'x')
vma_area->e->prot |= PROT_EXEC;
if (s == 's')
vma_area->e->flags = MAP_SHARED;
else if (s == 'p')
vma_area->e->flags = MAP_PRIVATE;
else {
pr_err("Unexpected VMA met (%c)\n", s);
goto err;
}
if (vma_area->e->status != 0) {
continue;
} else if (strstr(buf, "[vsyscall]") || strstr(buf, "[vectors]")) {
vma_area->e->status |= VMA_AREA_VSYSCALL;
} else if (strstr(buf, "[vdso]")) {
vma_area->e->status |= VMA_AREA_REGULAR;
if ((vma_area->e->prot & VDSO_PROT) == VDSO_PROT)
vma_area->e->status |= VMA_AREA_VDSO;
} else if (strstr(buf, "[heap]")) {
vma_area->e->status |= VMA_AREA_REGULAR | VMA_AREA_HEAP;
} else {
vma_area->e->status = VMA_AREA_REGULAR;
}
/*
* Some mapping hints for restore, we save this on
* disk and restore might need to analyze it.
*/
if (vma_area->file_borrowed) {
struct vma_area *prev = prev_vfi.vma;
/*
* Pick-up flags that might be set in the branch below.
* Status is copied as-is as it should be zero here,
* and have full match with the previous.
*/
vma_area->e->flags |= (prev->e->flags & MAP_ANONYMOUS);
vma_area->e->status = prev->e->status;
vma_area->e->shmid = prev->e->shmid;
vma_area->st = prev->st;
} else if (vma_area->vm_file_fd >= 0) {
struct stat *st_buf;
st_buf = vma_area->st = xmalloc(sizeof(*st_buf));
if (!st_buf)
goto err;
if (fstat(vma_area->vm_file_fd, st_buf) < 0) {
pr_perror("Failed fstat on %d's map %lu", pid, start);
goto err;
}
if (!S_ISREG(st_buf->st_mode) &&
!(S_ISCHR(st_buf->st_mode) && st_buf->st_rdev == DEVZERO)) {
pr_err("Can't handle non-regular mapping on %d's map %lu\n", pid, start);
goto err;
}
/*
* /dev/zero stands for anon-shared mapping
* otherwise it's some file mapping.
*/
if (is_anon_shmem_map(st_buf->st_dev)) {
if (!(vma_area->e->flags & MAP_SHARED))
goto err_bogus_mapping;
vma_area->e->flags |= MAP_ANONYMOUS;
vma_area->e->status |= VMA_ANON_SHARED;
vma_area->e->shmid = st_buf->st_ino;
if (!strcmp(file_path, "/SYSV")) {
pr_info("path: %s\n", file_path);
vma_area->e->status |= VMA_AREA_SYSVIPC;
}
} else {
if (vma_area->e->flags & MAP_PRIVATE)
vma_area->e->status |= VMA_FILE_PRIVATE;
else
vma_area->e->status |= VMA_FILE_SHARED;
}
} else {
/*
* No file but mapping -- anonymous one.
*/
if (vma_area->e->flags & MAP_SHARED) {
vma_area->e->status |= VMA_ANON_SHARED;
vma_area->e->shmid = vfi.ino;
} else {
vma_area->e->status |= VMA_ANON_PRIVATE;
}
vma_area->e->flags |= MAP_ANONYMOUS;
}
}
vma_area = NULL;
ret = 0;
err:
if (smaps)
fclose(smaps);
if (map_files_dir)
closedir(map_files_dir);
xfree(vma_area);
return ret;
err_bogus_mapping:
pr_err("Bogus mapping 0x%"PRIx64"-0x%"PRIx64" (flags: %#x vm_file_fd: %d)\n",
vma_area->e->start, vma_area->e->end,
vma_area->e->flags, vma_area->vm_file_fd);
goto err;
err_bogus_mapfile:
pr_perror("Can't open %d's mapfile link %lx", pid, start);
goto err;
}
int parse_pid_stat_small(pid_t pid, struct proc_pid_stat_small *s)
{
char *tok, *p;
int fd;
int n;
fd = open_proc(pid, "stat");
if (fd < 0)
return -1;
n = read(fd, buf, BUF_SIZE);
if (n < 1) {
pr_err("stat for %d is corrupted\n", pid);
close(fd);
return -1;
}
close(fd);
memset(s, 0, sizeof(*s));
tok = strchr(buf, ' ');
if (!tok)
goto err;
*tok++ = '\0';
if (*tok != '(')
goto err;
s->pid = atoi(buf);
p = strrchr(tok + 1, ')');
if (!p)
goto err;
*tok = '\0';
*p = '\0';
strncpy(s->comm, tok + 1, sizeof(s->comm));
n = sscanf(p + 1, " %c %d %d %d", &s->state, &s->ppid, &s->pgid, &s->sid);
if (n < 4)
goto err;
return 0;
err:
pr_err("Parsing %d's stat failed (#fields do not match)\n", pid);
return -1;
}
int parse_pid_stat(pid_t pid, struct proc_pid_stat *s)
{
char *tok, *p;
int fd;
int n;
fd = open_proc(pid, "stat");
if (fd < 0)
return -1;
n = read(fd, buf, BUF_SIZE);
if (n < 1) {
pr_err("stat for %d is corrupted\n", pid);
close(fd);
return -1;
}
close(fd);
memset(s, 0, sizeof(*s));
tok = strchr(buf, ' ');
if (!tok)
goto err;
*tok++ = '\0';
if (*tok != '(')
goto err;
s->pid = atoi(buf);
p = strrchr(tok + 1, ')');
if (!p)
goto err;
*tok = '\0';
*p = '\0';
strncpy(s->comm, tok + 1, sizeof(s->comm));
n = sscanf(p + 1,
" %c %d %d %d %d %d %u %lu %lu %lu %lu "
"%lu %lu %ld %ld %ld %ld %d %d %llu %lu %ld %lu %lu %lu %lu "
"%lu %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld "
"%lu %lu %lu %lu %lu %lu %lu %d",
&s->state,
&s->ppid,
&s->pgid,
&s->sid,
&s->tty_nr,
&s->tty_pgrp,
&s->flags,
&s->min_flt,
&s->cmin_flt,
&s->maj_flt,
&s->cmaj_flt,
&s->utime,
&s->stime,
&s->cutime,
&s->cstime,
&s->priority,
&s->nice,
&s->num_threads,
&s->zero0,
&s->start_time,
&s->vsize,
&s->mm_rss,
&s->rsslim,
&s->start_code,
&s->end_code,
&s->start_stack,
&s->esp,
&s->eip,
&s->sig_pending,
&s->sig_blocked,
&s->sig_ignored,
&s->sig_handled,
&s->wchan,
&s->zero1,
&s->zero2,
&s->exit_signal,
&s->task_cpu,
&s->rt_priority,
&s->policy,
&s->delayacct_blkio_ticks,
&s->gtime,
&s->cgtime,
&s->start_data,
&s->end_data,
&s->start_brk,
&s->arg_start,
&s->arg_end,
&s->env_start,
&s->env_end,
&s->exit_code);
if (n < 50)
goto err;
return 0;
err:
pr_err("Parsing %d's stat failed (#fields do not match)\n", pid);
return -1;
}
static int ids_parse(char *str, unsigned int *arr)
{
char *end;
arr[0] = strtol(str, &end, 10);
arr[1] = strtol(end + 1, &end, 10);
arr[2] = strtol(end + 1, &end, 10);
arr[3] = strtol(end + 1, &end, 10);
if (*end != '\n')
return -1;
else
return 0;
}
static int cap_parse(char *str, unsigned int *res)
{
int i, ret;
for (i = 0; i < PROC_CAP_SIZE; i++) {
ret = sscanf(str, "%08x", &res[PROC_CAP_SIZE - 1 - i]);
if (ret != 1)
return -1;
str += 8;
}
return 0;
}
int parse_pid_status(pid_t pid, struct proc_status_creds *cr)
{
int done = 0;
FILE *f;
char str[64];
f = fopen_proc(pid, "status");
if (f == NULL) {
pr_perror("Can't open proc status");
return -1;
}
while (done < 6 && fgets(str, sizeof(str), f)) {
if (!strncmp(str, "Uid:", 4)) {
if (ids_parse(str + 5, cr->uids))
goto err_parse;
done++;
}
if (!strncmp(str, "Gid:", 4)) {
if (ids_parse(str + 5, cr->gids))
goto err_parse;
done++;
}
if (!strncmp(str, "CapInh:", 7)) {
if (cap_parse(str + 8, cr->cap_inh))
goto err_parse;
done++;
}
if (!strncmp(str, "CapEff:", 7)) {
if (cap_parse(str + 8, cr->cap_eff))
goto err_parse;
done++;
}
if (!strncmp(str, "CapPrm:", 7)) {
if (cap_parse(str + 8, cr->cap_prm))
goto err_parse;
done++;
}
if (!strncmp(str, "CapBnd:", 7)) {
if (cap_parse(str + 8, cr->cap_bnd))
goto err_parse;
done++;
}
}
if (done != 6) {
err_parse:
pr_err("Error parsing proc status file\n");
fclose(f);
return -1;
}
fclose(f);
return 0;
}
struct opt2flag {
char *opt;
unsigned flag;
};
static int do_opt2flag(char *opt, unsigned *flags,
const struct opt2flag *opts, char *unknown)
{
int i;
char *end;
while (1) {
end = strchr(opt, ',');
if (end)
*end = '\0';
for (i = 0; opts[i].opt != NULL; i++)
if (!strcmp(opts[i].opt, opt)) {
(*flags) |= opts[i].flag;
break;
}
if (opts[i].opt == NULL) {
if (!unknown) {
pr_err("Unknown option [%s]\n", opt);
return -1;
}
strcpy(unknown, opt);
unknown += strlen(opt);
*unknown = ',';
unknown++;
}
if (!end) {
if (unknown)
*unknown = '\0';
break;
} else
opt = end + 1;
}
return 0;
}
static int parse_mnt_flags(char *opt, unsigned *flags)
{
const struct opt2flag mnt_opt2flag[] = {
{ "rw", 0, },
{ "ro", MS_RDONLY, },
{ "nosuid", MS_NOSUID, },
{ "nodev", MS_NODEV, } ,
{ "noexec", MS_NOEXEC, },
{ "noatime", MS_NOATIME, },
{ "nodiratime", MS_NODIRATIME, },
{ "relatime", MS_RELATIME, },
{ },
};
return do_opt2flag(opt, flags, mnt_opt2flag, NULL);
}
static int parse_sb_opt(char *opt, unsigned *flags, char *uopt)
{
const struct opt2flag sb_opt2flag[] = {
{ "rw", 0, },
{ "ro", MS_RDONLY, },
{ "sync", MS_SYNC, },
{ "dirsync", MS_DIRSYNC, },
{ "mad", MS_MANDLOCK, },
{ },
};
return do_opt2flag(opt, flags, sb_opt2flag, uopt);
}
static int parse_mnt_opt(char *str, struct mount_info *mi, int *off)
{
char *istr = str, *end;
while (1) {
end = strchr(str, ' ');
if (!end) {
pr_err("Error parsing mount options\n");
return -1;
}
*end = '\0';
if (!strncmp(str, "-", 1))
break;
else if (!strncmp(str, "shared:", 7)) {
mi->flags |= MS_SHARED;
mi->shared_id = atoi(str + 7);
} else if (!strncmp(str, "master:", 7)) {
mi->flags |= MS_SLAVE;
mi->master_id = atoi(str + 7);
} else if (!strncmp(str, "propagate_from:", 15)) {
/* skip */;
} else if (!strncmp(str, "unbindable", 11))
mi->flags |= MS_UNBINDABLE;
else {
pr_err("Unknown option [%s]\n", str);
return -1;
}
str = end + 1;
}
*off = end - istr + 1;
return 0;
}
static int parse_mountinfo_ent(char *str, struct mount_info *new)
{
unsigned int kmaj, kmin;
int ret, n;
char *opt;
char *fstype;
new->mountpoint = xmalloc(PATH_MAX);
if (new->mountpoint == NULL)
return -1;
new->mountpoint[0] = '.';
ret = sscanf(str, "%i %i %u:%u %ms %s %ms %n",
&new->mnt_id, &new->parent_mnt_id,
&kmaj, &kmin, &new->root, new->mountpoint + 1,
&opt, &n);
if (ret != 7) {
xfree(new->mountpoint);
return -1;
}
new->mountpoint = xrealloc(new->mountpoint, strlen(new->mountpoint) + 1);
new->s_dev = MKKDEV(kmaj, kmin);
new->flags = 0;
if (parse_mnt_flags(opt, &new->flags))
return -1;
free(opt); /* after %ms scanf */
str += n;
if (parse_mnt_opt(str, new, &n))
return -1;
str += n;
ret = sscanf(str, "%ms %ms %ms", &fstype, &new->source, &opt);
if (ret != 3)
return -1;
ret = -1;
new->fstype = find_fstype_by_name(fstype);
new->options = xmalloc(strlen(opt) + 1);
if (!new->options)
goto err;
if (parse_sb_opt(opt, &new->flags, new->options))
goto err;
ret = 0;
err:
free(opt);
free(fstype);
return ret;
}
struct mount_info *parse_mountinfo(pid_t pid, struct ns_id *nsid)
{
struct mount_info *list = NULL;
FILE *f;
char str[1024];
snprintf(str, sizeof(str), "/proc/%d/mountinfo", pid);
f = fopen(str, "r");
if (!f) {
pr_perror("Can't open %d mountinfo", pid);
return NULL;
}
while (fgets(str, sizeof(str), f)) {
struct mount_info *new;
int ret;
new = mnt_entry_alloc();
if (!new)
goto err;
new->nsid = nsid;
new->next = list;
list = new;
ret = parse_mountinfo_ent(str, new);
if (ret < 0) {
pr_err("Bad format in %d mountinfo\n", pid);
goto err;
}
pr_info("\ttype %s source %s %x %s @ %s flags %x options %s\n",
new->fstype->name, new->source,
new->s_dev, new->root, new->mountpoint,
new->flags, new->options);
if (new->fstype->parse) {
ret = new->fstype->parse(new);
if (ret) {
pr_err("Failed to parse FS specific data on %s\n",
new->mountpoint);
goto err;
}
}
}
out:
fclose(f);
return list;
err:
while (list) {
struct mount_info *next = list->next;
mnt_entry_free(list);
list = next;
}
goto out;
}
static char nybble(const char n)
{
if (n >= '0' && n <= '9')
return n - '0';
else if (n >= 'A' && n <= 'F')
return n - ('A' - 10);
else if (n >= 'a' && n <= 'f')
return n - ('a' - 10);
return 0;
}
static int alloc_fhandle(FhEntry *fh)
{
fh->n_handle = FH_ENTRY_SIZES__min_entries;
fh->handle = xmalloc(pb_repeated_size(fh, handle));
return fh->handle == NULL ? -1 : 0;
}
static void free_fhandle(FhEntry *fh)
{
if (fh->handle)
xfree(fh->handle);
}
static void parse_fhandle_encoded(char *tok, FhEntry *fh)
{
char *d = (char *)fh->handle;
int i = 0;
memzero(d, pb_repeated_size(fh, handle));
while (*tok == ' ')