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lib.c
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/******************************************************************************
* @file lib.c
*****************************************************************************/
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "lib.h"
#include "mkfs.h"
#include "report.h"
struct option {
const char *name;
int index, flags;
};
#define OPTION_NO_ARG 0x0001
#define OPTION_HAS_ARG 0x0002
enum options {
OPTION_IGNORED = 0,
OPTION_BLOCKS,
OPTION_BOOT,
OPTION_FAT,
OPTION_HELP,
OPTION_NAME,
OPTION_OFFSET,
OPTION_SECTORS,
OPTION_VERBOSE
};
static struct option opts[] = {
{ "F", OPTION_FAT, OPTION_HAS_ARG },
{ "n", OPTION_NAME, OPTION_HAS_ARG },
{ "s", OPTION_SECTORS, OPTION_HAS_ARG },
{ "v", OPTION_VERBOSE, OPTION_NO_ARG },
{ "-boot", OPTION_BOOT, OPTION_HAS_ARG },
{ "-blocks", OPTION_BLOCKS, OPTION_HAS_ARG },
{ "-help", OPTION_HELP, OPTION_NO_ARG },
{ "-offset", OPTION_OFFSET, OPTION_HAS_ARG },
{ 0, 0, 0 }
};
static int strstart (const char *val, const char **str) {
const char *p = val;
const char *q = *str;
while (*p != '\0') {
if (*p != *q) {
return 0;
}
++p;
++q;
}
*str = q;
return 1;
}
static void print_help (void) {
if (!program_name) {
goto _exit;
}
fprintf (stderr, "Usage: %s [options] file\n\n", program_name);
fprintf (stderr, "Options:\n\n");
fprintf (stderr, " Short options:\n\n");
fprintf (stderr, " -F BITS Select FAT size BITS (12, 16, or 32).\n");
fprintf (stderr, " -n LABEL Set volume label as LABEL (max 11 characters).\n");
fprintf (stderr, " -v Verbose execution.\n");
fprintf (stderr, "\n");
fprintf (stderr, " Long options:\n\n");
fprintf (stderr, " --blocks BLOCKS Make the filesystem the size of BLOCKS * 1024.\n");
fprintf (stderr, " --boot FILE Use FILE as the boot sector.\n");
fprintf (stderr, " --help Show this help information then exit.\n");
fprintf (stderr, " --offset SECTOR Write the filesystem starting at SECTOR.\n");
_exit:
exit (EXIT_SUCCESS);
}
static int is_label_char (int ch) {
return ((ch & 0x80) || (ch == 0x20) || isalnum (ch) || strchr ("!#$%'-@_{}~", ch));
}
char *xstrdup (const char *str) {
char *ptr = xmalloc (strlen (str) + 1);
strcpy (ptr, str);
return ptr;
}
int xstrcasecmp (const char *s1, const char *s2) {
const unsigned char *p1;
const unsigned char *p2;
p1 = (const unsigned char *) s1;
p2 = (const unsigned char *) s2;
while (*p1 != '\0') {
if (toupper (*p1) < toupper (*p2)) {
return (-1);
} else if (toupper (*p1) > toupper (*p2)) {
return (1);
}
p1++;
p2++;
}
if (*p2 == '\0') {
return (0);
} else {
return (-1);
}
}
void *xmalloc (size_t size) {
void *ptr = malloc (size);
if (ptr == NULL && size) {
report_at (program_name, 0, REPORT_ERROR, "memory full (malloc)");
exit (EXIT_FAILURE);
}
memset (ptr, 0, size);
return ptr;
}
void *xrealloc (void *ptr, size_t size) {
void *new_ptr = realloc (ptr, size);
if (new_ptr == NULL && size) {
report_at (program_name, 0, REPORT_ERROR, "memory full (realloc)");
exit (EXIT_FAILURE);
}
return new_ptr;
}
void dynarray_add (void *ptab, size_t *nb_ptr, void *data) {
int nb, nb_alloc;
void **pp;
nb = *nb_ptr;
pp = *(void ***) ptab;
if ((nb & (nb - 1)) == 0) {
if (!nb) {
nb_alloc = 1;
} else {
nb_alloc = nb * 2;
}
pp = xrealloc (pp, nb_alloc * sizeof (void *));
*(void ***) ptab = pp;
}
pp[nb++] = data;
*nb_ptr = nb;
}
void parse_args (int *pargc, char ***pargv, int optind) {
char **argv = *pargv;
int argc = *pargc;
struct option *popt;
const char *optarg, *r;
if (argc == optind) {
print_help ();
}
memset (state->label, ' ', 11);
while (optind < argc) {
r = argv[optind++];
if (r[0] != '-' || r[1] == '\0') {
if (state->outfile) {
report_at (program_name, 0, REPORT_ERROR, "multiple output files provided");
exit (EXIT_FAILURE);
}
state->outfile = xstrdup (r);
continue;
}
for (popt = opts; popt; ++popt) {
const char *p1 = popt->name;
const char *r1 = (r + 1);
if (!p1) {
report_at (program_name, 0, REPORT_ERROR, "invalid option -- '%s'", r);
exit (EXIT_FAILURE);
}
if (!strstart (p1, &r1)) {
continue;
}
optarg = r1;
if (popt->flags & OPTION_HAS_ARG) {
if (*optarg == '\0') {
if (optind >= argc) {
report_at (program_name, 0, REPORT_ERROR, "argument to '%s' is missing", r);
exit (EXIT_FAILURE);
}
optarg = argv[optind++];
}
} else if (*optarg != '\0') {
continue;
}
break;
}
switch (popt->index) {
case OPTION_BLOCKS: {
long conversion;
char *temp;
errno = 0;
conversion = strtol (optarg, &temp, 0);
if (!*optarg || isspace ((int) *optarg) || errno || *temp) {
report_at (program_name, 0, REPORT_ERROR, "bad number for blocks");
exit (EXIT_FAILURE);
}
if (conversion < 0) {
report_at (program_name, 0, REPORT_ERROR, "blocks must be greater than zero");
exit (EXIT_FAILURE);
}
state->blocks = conversion;
break;
}
case OPTION_BOOT: {
state->boot = xstrdup (optarg);
break;
}
case OPTION_FAT: {
long conversion;
char *temp;
errno = 0;
conversion = strtol (optarg, &temp, 0);
if (!*optarg || isspace ((int) *optarg) || errno || *temp) {
report_at (program_name, 0, REPORT_ERROR, "bad number for fat size");
exit (EXIT_FAILURE);
}
switch (conversion) {
case 12:
case 16:
case 32:
break;
default:
report_at (program_name, 0, REPORT_ERROR, "fat size can either be 12, 16 or 32 bits");
exit (EXIT_FAILURE);
}
state->size_fat = conversion;
state->size_fat_by_user = 1;
break;
}
case OPTION_HELP: {
print_help ();
break;
}
case OPTION_NAME: {
int n;
if (strlen (optarg) > 11) {
report_at (program_name, 0, REPORT_ERROR, "volume label cannot exceed 11 characters");
exit (EXIT_FAILURE);
}
for (n = 0; optarg[n] != '\0'; n++) {
if (!is_label_char (optarg[n])) {
report_at (program_name, 0, REPORT_ERROR, "volume label contains an invalid character");
exit (EXIT_FAILURE);
}
state->label[n] = toupper (optarg[n]);
}
break;
}
case OPTION_OFFSET: {
long conversion;
char *temp;
errno = 0;
conversion = strtol (optarg, &temp, 0);
if (!*optarg || isspace ((int) *optarg) || *temp || errno) {
report_at (program_name, 0, REPORT_ERROR, "bad number for offset");
exit (EXIT_FAILURE);
}
if (conversion < 0 || (unsigned long) conversion > UINT_MAX) {
report_at (program_name, 0, REPORT_ERROR, "offset must be between 0 and %u", UINT_MAX);
exit (EXIT_FAILURE);
}
state->offset = (size_t) conversion;
break;
}
case OPTION_SECTORS: {
long conversion;
char *temp;
errno = 0;
conversion = strtol (optarg, &temp, 0);
if (!*optarg || isspace ((int) *optarg) || *temp || errno) {
report_at (program_name, 0, REPORT_ERROR, "bad number for sectors per cluster");
exit (EXIT_FAILURE);
}
if (conversion != 1 && conversion != 2 && conversion != 4 && conversion != 8 && conversion != 16 && conversion != 32 && conversion != 64 && conversion != 128) {
report_at (program_name, 0, REPORT_ERROR, "bad number for sectors per cluster");
exit (EXIT_FAILURE);
}
state->sectors_per_cluster = (unsigned char) conversion;
break;
}
case OPTION_VERBOSE: {
state->verbose++;
break;
}
default: {
report_at (program_name, 0, REPORT_ERROR, "unsupported option '%s'", r);
exit (EXIT_FAILURE);
}
}
}
if (memcmp (state->label, " ", 11) == 0) {
memcpy (state->label, "NO NAME ", 11);
}
}