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modprobe-small: make string buffer code robust; fix help text

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together with previous one-liner:

function                                             old     new   delta
append                                                70      99     +29
parse_module                                         295     311     +16
copy_stringbuf                                        35      36      +1
packed_usage                                       26545   26540      -5
appendc                                               27       -     -27
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 3/1 up/down: 46/-32)             Total: 14 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-09-07 02:38:26 +02:00
parent f9c814b0ee
commit 0c6914e50c
2 changed files with 36 additions and 19 deletions
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15
include/usage.h
View File

@ -2824,9 +2824,21 @@
"-rw------- 1 andersen andersen 0 Apr 25 17:10 /tmp/temp.mWiLjM\n"
#define modprobe_trivial_usage \
"[-knqrsv] MODULE [symbol=value...]"
IF_MODPROBE_SMALL("[-qfwrsv] MODULE [symbol=value...]") \
IF_NOT_MODPROBE_SMALL("[-" \
IF_FEATURE_2_4_MODULES("k")"nqrsv" \
IF_FEATURE_MODPROBE_BLACKLIST("b")"] MODULE [symbol=value...]")
#define modprobe_full_usage "\n\n" \
"Options:" \
IF_MODPROBE_SMALL( \
"\n -q Quiet" \
"\n -f Force" \
"\n -w Wait for unload" \
"\n -r Remove module (stacks) or do autoclean" \
"\n -s Report via syslog instead of stderr" \
"\n -v Verbose" \
) \
IF_NOT_MODPROBE_SMALL( \
IF_FEATURE_2_4_MODULES( \
"\n -k Make module autoclean-able" \
) \
@ -2837,6 +2849,7 @@
"\n -v Verbose" \
IF_FEATURE_MODPROBE_BLACKLIST( \
"\n -b Apply blacklist to module names too" \
) \
)
#define modprobe_notes_usage \

36
modutils/modprobe-small.c
View File

@ -44,11 +44,13 @@ struct globals {
char *module_load_options;
smallint dep_bb_seen;
smallint wrote_dep_bb_ok;
int module_count;
unsigned module_count;
int module_found_idx;
int stringbuf_idx;
char stringbuf[32 * 1024]; /* some modules have lots of stuff */
unsigned stringbuf_idx;
unsigned stringbuf_size;
char *stringbuf; /* some modules have lots of stuff */
/* for example, drivers/media/video/saa7134/saa7134.ko */
/* therefore having a fixed biggish buffer is not wise */
};
#define G (*ptr_to_globals)
#define modinfo (G.modinfo )
@ -58,15 +60,28 @@ struct globals {
#define module_found_idx (G.module_found_idx )
#define module_load_options (G.module_load_options)
#define stringbuf_idx (G.stringbuf_idx )
#define stringbuf_size (G.stringbuf_size )
#define stringbuf (G.stringbuf )
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)
static void append(const char *s)
{
unsigned len = strlen(s);
if (stringbuf_idx + len + 15 > stringbuf_size) {
stringbuf_size = stringbuf_idx + len + 127;
dbg2_error_msg("grow stringbuf to %u", stringbuf_size);
stringbuf = xrealloc(stringbuf, stringbuf_size);
}
memcpy(stringbuf + stringbuf_idx, s, len);
stringbuf_idx += len;
}
static void appendc(char c)
{
if (stringbuf_idx < sizeof(stringbuf))
/* We appendc() only after append(), + 15 trick in append()
* makes it unnecessary to check for overflow here */
stringbuf[stringbuf_idx++] = c;
}
@ -76,15 +91,6 @@ static void bksp(void)
stringbuf_idx--;
}
static void append(const char *s)
{
size_t len = strlen(s);
if (stringbuf_idx + len < sizeof(stringbuf)) {
memcpy(stringbuf + stringbuf_idx, s, len);
stringbuf_idx += len;
}
}
static void reset_stringbuf(void)
{
stringbuf_idx = 0;
@ -92,7 +98,7 @@ static void reset_stringbuf(void)
static char* copy_stringbuf(void)
{
char *copy = xmalloc(stringbuf_idx);
char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */
return memcpy(copy, stringbuf, stringbuf_idx);
}
@ -216,7 +222,6 @@ static void parse_module(module_info *info, const char *pathname)
pos = (ptr - module_image);
}
bksp(); /* remove last ' ' */
appendc('\0');
info->aliases = copy_stringbuf();
replace(info->aliases, '-', '_');
@ -229,7 +234,6 @@ static void parse_module(module_info *info, const char *pathname)
dbg2_error_msg("dep:'%s'", ptr);
append(ptr);
}
appendc('\0');
info->deps = copy_stringbuf();
free(module_image);