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thin_metadata_size: remove superfluous array; streamline

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This commit is contained in:
Heinz Mauelshagen 2013-07-17 17:24:55 +02:00
parent 03d2ca3a99
commit ce4e01d8c9
1 changed files with 29 additions and 38 deletions
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67
thin-provisioning/thin_metadata_size.c
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@ -38,15 +38,14 @@ enum return_units { RETURN_BYTES, RETURN_SECTORS };
struct global {
char *prg; /* program name */
#define UNIT_ARRAY_SZ 18
struct {
char *chars;
char *strings[UNIT_ARRAY_SZ];
unsigned long long factors[UNIT_ARRAY_SZ];
char **strings;
unsigned long long *factors;
} unit;
struct options {
char *unit;
unsigned unit_idx;
char *s[OPT_END];
unsigned long long n[OPT_END];
} options;
@ -54,19 +53,8 @@ struct global {
static void exit_prg(struct global *g, int ret)
{
if (g) {
unsigned u;
if (g->options.unit)
free(g->options.unit);
for (u = OPT_END; u--; ) {
if (g->options.s[u])
free(g->options.s[u]);
}
if (g)
free(g);
}
exit(ret);
}
@ -79,39 +67,38 @@ static void abort_prg(struct global *g, const char *msg)
static struct global *init_prg(char *prg_path)
{
unsigned u = 0;
unsigned u;
static char *unit_chars = "bskKmMgGtTpPeEzZyY";
static char *unit_strings[] = { "bytes", "sectors",
"kilobytes", "kibibytes", "megabytes", "mebibytes",
"gigabytes", "gibibytes", "terabytes", "tebibytes",
"petabytes", "pebibytes", "exabytes", "ebibytes",
"zetabytes", "zebibytes", "yottabytes", "yobibytes" };
"zetabytes", "zebibytes", "yottabytes", "yobibytes", NULL };
static unsigned long long unit_factors[18] = { 1, 512, 1024, 1000 };
struct global *r = malloc(sizeof(*r));
if (!r)
abort_prg(r, "failed to allocate global context!");
memset(r, 0, sizeof(*r));
r->prg = basename(prg_path);
r->unit.chars = "bskKmMgGtTpPeEzZyY";
r->unit.factors[u++] = 1;
r->unit.factors[u++] = 512;
r->unit.factors[u++] = 1024;
r->unit.factors[u++] = 1000;
for ( ; u < UNIT_ARRAY_SZ; u += 2) {
r->unit.factors[u] = r->unit.factors[2] * r->unit.factors[u - 2];
r->unit.factors[u+1] = r->unit.factors[3] * r->unit.factors[u - 1];
for (u = 4; unit_strings[u]; u += 2) {
unit_factors[u] = unit_factors[u-2] * unit_factors[2];
unit_factors[u+1] = unit_factors[u-1] * unit_factors[3];
}
for (u = UNIT_ARRAY_SZ; u--; )
r->unit.strings[u] = unit_strings[u];
r->prg = basename(prg_path);
r->unit.chars = unit_chars;
r->unit.strings = unit_strings;
r->unit.factors = unit_factors;
return r;
}
#define bytes_per_sector(g) (g)->unit.factors[1]
#define bytes_per_sector(g) (g)->unit.factors[get_index(g, "sectors")]
static int get_index(struct global *g, char *unit_string)
{
unsigned len, u;
unsigned len;
if (!unit_string)
return get_index(g, "sectors");
@ -124,9 +111,11 @@ static int get_index(struct global *g, char *unit_string)
return o - g->unit.chars;
} else {
for (u = UNIT_ARRAY_SZ; u--; )
if (!strncmp(g->unit.strings[u], unit_string, len))
return u;
char **s;
for (s = g->unit.strings; *s; s++)
if (!strncmp(*s, unit_string, len))
return s - g->unit.strings;
}
return -1;
@ -206,10 +195,12 @@ static void version(struct global *g)
static void check_unit(struct global *g, char *arg)
{
if (get_index(g, arg) < 0)
int idx = get_index(g, arg);
if (idx < 0)
abort_prg(g, "output unit specifier invalid!");
g->options.unit = strdup(arg);
g->options.unit_idx = idx;
}
static void check_numeric_option(struct global *g, char *arg)
@ -235,7 +226,7 @@ static void check_size(struct global *g, enum numeric_options o, char *arg)
abort_prg(g, "option already given!");
g->options.n[o] = to_bytes(g, arg, o == MAXTHINS ? RETURN_BYTES : RETURN_SECTORS, &idx);
g->options.s[o] = malloc(strlen(arg) + (idx > -1) ? strlen(g->unit.strings[idx]) : 0 + 1);
g->options.s[o] = malloc(strlen(arg) + ((idx > -1) ? strlen(g->unit.strings[idx]) : 0) + 1);
if (!g->options.s[o])
abort_prg(g, "failed to allocate string!");
@ -323,7 +314,7 @@ static void printf_precision(struct global *g, double r, unsigned idx)
static void print_estimated_result(struct global *g)
{
unsigned idx = get_index(g, g->options.unit);
unsigned idx = g->options.unit_idx;
double r;
/* double-fold # of nodes, because they aren't fully populated in average */