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ps: fix overflow in USER and VSZ columns

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function                                             old     new   delta
smart_ulltoa4                                          -     280    +280
smart_ulltoa5                                        283     408    +125
ulltoa6_and_space                                      -      25     +25
scale                                                 28      38     +10
bbunpack                                             358     366      +8
ps_main                                              259     261      +2
glob3                                                 35      37      +2
fill_bounds                                          172     174      +2
process_stdin                                        456     446     -10
smart_ulltoa6                                        406       -    -406
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 6/1 up/down: 454/-416)           Total: 38 bytes
This commit is contained in:
Denis Vlasenko 2008-01-06 03:26:53 +00:00
parent 5fee2e1a79
commit 56ea65ca5f
5 changed files with 99 additions and 83 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/libbb.h
View File

@ -503,7 +503,9 @@ char *itoa(int n);
/* Returns a pointer past the formatted number, does NOT null-terminate */
char *utoa_to_buf(unsigned n, char *buf, unsigned buflen);
char *itoa_to_buf(int n, char *buf, unsigned buflen);
void smart_ulltoa5(unsigned long long ul, char buf[5]);
/* Intelligent formatters of bignums */
void smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale);
void smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale);
//TODO: provide pointer to buf (avoid statics)?
const char *make_human_readable_str(unsigned long long size,
unsigned long block_size, unsigned long display_unit);

69
libbb/xfuncs.c
View File

@ -282,10 +282,10 @@ void xsetenv(const char *key, const char *value)
bb_error_msg_and_die(bb_msg_memory_exhausted);
}
// Converts unsigned long long value into compact 4-char
// representation. Examples: "1234", "1.2k", " 27M", "123T"
// Fifth char is always '\0'
void smart_ulltoa5(unsigned long long ul, char buf[5])
/* Converts unsigned long long value into compact 4-char
* representation. Examples: "1234", "1.2k", " 27M", "123T"
* String is not terminated (buf[4] is untouched) */
void smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale)
{
const char *fmt;
char c;
@ -327,13 +327,66 @@ void smart_ulltoa5(unsigned long long ul, char buf[5])
buf[1] = '.';
}
buf[2] = "0123456789"[v];
// see http://en.wikipedia.org/wiki/Tera
// (small letters stand out better versus numbers)
buf[3] = " kmgtpezy"[idx];
buf[3] = scale[idx]; /* typically scale = " kmgt..." */
}
buf[4] = '\0';
}
/* Converts unsigned long long value into compact 5-char representation.
* String is not terminated (buf[5] is untouched) */
void smart_ulltoa5(unsigned long long ul, char buf[6], const char *scale)
{
const char *fmt;
char c;
unsigned v, u, idx = 0;
if (ul > 99999) { // do not scale if 99999 or less
ul *= 10;
do {
ul /= 1024;
idx++;
} while (ul >= 100000);
}
v = ul; // ullong divisions are expensive, avoid them
fmt = " 123456789";
u = v / 10;
v = v % 10;
if (!idx) {
// 99999 or less: use "12345" format
// u is value/10, v is last digit
c = buf[0] = " 123456789"[u/1000];
if (c != ' ') fmt = "0123456789";
c = buf[1] = fmt[u/100%10];
if (c != ' ') fmt = "0123456789";
c = buf[2] = fmt[u/10%10];
if (c != ' ') fmt = "0123456789";
buf[3] = fmt[u%10];
buf[4] = "0123456789"[v];
} else {
// value has been scaled into 0..9999.9 range
// u is value, v is 1/10ths (allows for 92.1M format)
if (u >= 100) {
// value is >= 100: use "1234M', " 123M" formats
c = buf[0] = " 123456789"[u/1000];
if (c != ' ') fmt = "0123456789";
c = buf[1] = fmt[u/100%10];
if (c != ' ') fmt = "0123456789";
v = u % 10;
u = u / 10;
buf[2] = fmt[u%10];
} else {
// value is < 100: use "92.1M" format
c = buf[0] = " 123456789"[u/10];
if (c != ' ') fmt = "0123456789";
buf[1] = fmt[u%10];
buf[2] = '.';
}
buf[3] = "0123456789"[v];
buf[4] = scale[idx]; /* typically scale = " kmgt..." */
}
}
// Convert unsigned integer to ascii, writing into supplied buffer.
// A truncated result contains the first few digits of the result ala strncpy.
// Returns a pointer past last generated digit, does _not_ store NUL.

5
procps/nmeter.c
View File

@ -257,7 +257,10 @@ static int rdval_diskstats(const char* p, ullong *vec)
static void scale(ullong ul)
{
char buf[5];
smart_ulltoa5(ul, buf);
/* see http://en.wikipedia.org/wiki/Tera */
smart_ulltoa4(ul, buf, " kmgtpezy");
buf[4] = '\0';
put(buf);
}

32
procps/ps.c
View File

@ -25,9 +25,9 @@ enum { MAX_WIDTH = 2*1024 };
#if ENABLE_SELINUX
#define SELINIX_O_PREFIX "label,"
#define DEFAULT_O_STR (SELINIX_O_PREFIX "pid,user" USE_FEATURE_PS_TIME(",time"))
#define DEFAULT_O_STR (SELINIX_O_PREFIX "pid,user" USE_FEATURE_PS_TIME(",time") ",args")
#else
#define DEFAULT_O_STR ("pid,user" USE_FEATURE_PS_TIME(",time"))
#define DEFAULT_O_STR ("pid,user" USE_FEATURE_PS_TIME(",time") ",args")
#endif
typedef struct {
@ -188,7 +188,10 @@ static void func_pgid(char *buf, int size, const procps_status_t *ps)
static void put_lu(char *buf, int size, unsigned long u)
{
char buf5[5];
smart_ulltoa5( ((unsigned long long)u) << 10, buf5);
/* see http://en.wikipedia.org/wiki/Tera */
smart_ulltoa4( (u, buf5, " mgtpezy");
buf5[5] = '\0';
sprintf(buf, "%.*s", size, buf5);
}
@ -505,9 +508,9 @@ int ps_main(int argc, char **argv)
#endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
if (use_selinux)
puts(" PID Context Stat Command");
puts(" PID CONTEXT STAT COMMAND");
else
puts(" PID Uid VSZ Stat Command");
puts(" PID USER VSZ STAT COMMAND");
while ((p = procps_scan(p, 0
| PSSCAN_PID
@ -519,7 +522,7 @@ int ps_main(int argc, char **argv)
))) {
#if ENABLE_SELINUX
if (use_selinux) {
len = printf("%5u %-32s %s ",
len = printf("%5u %-32.32s %s ",
p->pid,
p->context ? p->context : "unknown",
p->state);
@ -527,12 +530,17 @@ int ps_main(int argc, char **argv)
#endif
{
const char *user = get_cached_username(p->uid);
if (p->vsz == 0)
len = printf("%5u %-8s %s ",
p->pid, user, p->state);
else
len = printf("%5u %-8s %6lu %s ",
p->pid, user, p->vsz, p->state);
//if (p->vsz == 0)
// len = printf("%5u %-8.8s %s ",
// p->pid, user, p->state);
//else
{
char buf6[6];
smart_ulltoa5(p->vsz, buf6, " mgtpezy");
buf6[5] = '\0';
len = printf("%5u %-8.8s %s %s ",
p->pid, user, buf6, p->state);
}
}
{

72
procps/top.c
View File

@ -669,60 +669,10 @@ static void display_topmem_header(int scr_width)
#undef str
}
// Converts unsigned long long value into compact 5-char
// representation. Sixth char is always ' '
static void smart_ulltoa6(unsigned long long ul, char buf[6])
static void ulltoa6_and_space(unsigned long long ul, char buf[6])
{
const char *fmt;
char c;
unsigned v, u, idx = 0;
if (ul > 99999) { // do not scale if 99999 or less
ul *= 10;
do {
ul /= 1024;
idx++;
} while (ul >= 100000);
}
v = ul; // ullong divisions are expensive, avoid them
fmt = " 123456789";
u = v / 10;
v = v % 10;
if (!idx) {
// 99999 or less: use "12345" format
// u is value/10, v is last digit
c = buf[0] = " 123456789"[u/1000];
if (c != ' ') fmt = "0123456789";
c = buf[1] = fmt[u/100%10];
if (c != ' ') fmt = "0123456789";
c = buf[2] = fmt[u/10%10];
if (c != ' ') fmt = "0123456789";
buf[3] = fmt[u%10];
buf[4] = "0123456789"[v];
} else {
// value has been scaled into 0..9999.9 range
// u is value, v is 1/10ths (allows for 92.1M format)
if (u >= 100) {
// value is >= 100: use "1234M', " 123M" formats
c = buf[0] = " 123456789"[u/1000];
if (c != ' ') fmt = "0123456789";
c = buf[1] = fmt[u/100%10];
if (c != ' ') fmt = "0123456789";
v = u % 10;
u = u / 10;
buf[2] = fmt[u%10];
} else {
// value is < 100: use "92.1M" format
c = buf[0] = " 123456789"[u/10];
if (c != ' ') fmt = "0123456789";
buf[1] = fmt[u%10];
buf[2] = '.';
}
buf[3] = "0123456789"[v];
// see http://en.wikipedia.org/wiki/Tera
buf[4] = " mgtpezy"[idx];
}
/* see http://en.wikipedia.org/wiki/Tera */
smart_ulltoa5(ul, buf, " mgtpezy");
buf[5] = ' ';
}
@ -739,14 +689,14 @@ static NOINLINE void display_topmem_process_list(int count, int scr_width)
while (--count >= 0) {
// PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND
smart_ulltoa6(s->pid , &line_buf[0*6]);
smart_ulltoa6(s->vsz , &line_buf[1*6]);
smart_ulltoa6(s->vszrw , &line_buf[2*6]);
smart_ulltoa6(s->rss , &line_buf[3*6]);
smart_ulltoa6(s->rss_sh , &line_buf[4*6]);
smart_ulltoa6(s->dirty , &line_buf[5*6]);
smart_ulltoa6(s->dirty_sh, &line_buf[6*6]);
smart_ulltoa6(s->stack , &line_buf[7*6]);
ulltoa6_and_space(s->pid , &line_buf[0*6]);
ulltoa6_and_space(s->vsz , &line_buf[1*6]);
ulltoa6_and_space(s->vszrw , &line_buf[2*6]);
ulltoa6_and_space(s->rss , &line_buf[3*6]);
ulltoa6_and_space(s->rss_sh , &line_buf[4*6]);
ulltoa6_and_space(s->dirty , &line_buf[5*6]);
ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
ulltoa6_and_space(s->stack , &line_buf[7*6]);
line_buf[8*6] = '\0';
if (scr_width > MIN_WIDTH) {
read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);