top: code shrink
text data bss dec hex filename 853034 453 6820 860307 d2093 busybox_old 852726 453 6820 859999 d1f5f busybox_unstripped Signed-off-by: Maksym Kryzhanovskyy <xmaks@email.cz> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Maksym Kryzhanovskyy
Denys Vlasenko
parent
f2177abe1d
commit
87496aa081
119
procps/top.c
119
procps/top.c
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@ -696,111 +696,76 @@ static int topmem_sort(char *a, char *b)
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return inverted ? -n : n;
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}
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/* Cut "NNNN" out of " NNNN kb" */
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static char *grab_number(char *str, const char *match, unsigned sz)
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{
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if (strncmp(str, match, sz) == 0) {
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str = skip_whitespace(str + sz);
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(skip_non_whitespace(str))[0] = '\0';
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return xstrdup(str);
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}
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return NULL;
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}
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/* display header info (meminfo / loadavg) */
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static void display_topmem_header(int scr_width, int *lines_rem_p)
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{
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enum {
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TOTAL = 0, MFREE, BUF, CACHE,
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SWAPTOTAL, SWAPFREE, DIRTY,
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MWRITE, ANON, MAP, SLAB,
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NUM_FIELDS
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};
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static const char match[NUM_FIELDS][11] = {
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"\x09" "MemTotal:", // TOTAL
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"\x08" "MemFree:", // MFREE
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"\x08" "Buffers:", // BUF
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"\x07" "Cached:", // CACHE
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"\x0a" "SwapTotal:", // SWAPTOTAL
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"\x09" "SwapFree:", // SWAPFREE
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"\x06" "Dirty:", // DIRTY
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"\x0a" "Writeback:", // MWRITE
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"\x0a" "AnonPages:", // ANON
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"\x07" "Mapped:", // MAP
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"\x05" "Slab:", // SLAB
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};
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//TODO? Note that fields always appear in the above order.
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//Thus, as each new line read from /proc/meminfo, we can compare it *once*
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//with match[last_matched+1], instead of looping thru all match[i]'s.
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//If it matches, memorize its data and last_matched++ (and if == NUM_FIELDS,
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//we're done with reading /proc/meminfo!); otherwise fgets next line.
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//The code below is slower, but is robust against a case when /proc/meminfo
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//gets reordered in the future.
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char Z[NUM_FIELDS][sizeof(long long)*3];
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char linebuf[128];
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unsigned i;
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FILE *fp;
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union {
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struct {
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/* 1 */ char *total;
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/* 2 */ char *mfree;
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/* 3 */ char *buf;
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/* 4 */ char *cache;
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/* 5 */ char *swaptotal;
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/* 6 */ char *swapfree;
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/* 7 */ char *dirty;
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/* 8 */ char *mwrite;
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/* 9 */ char *anon;
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/* 10 */ char *map;
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/* 11 */ char *slab;
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} u;
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char *str[11];
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} Z;
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#define total Z.u.total
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#define mfree Z.u.mfree
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#define buf Z.u.buf
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#define cache Z.u.cache
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#define swaptotal Z.u.swaptotal
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#define swapfree Z.u.swapfree
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#define dirty Z.u.dirty
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#define mwrite Z.u.mwrite
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#define anon Z.u.anon
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#define map Z.u.map
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#define slab Z.u.slab
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#define str Z.str
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memset(&Z, 0, sizeof(Z));
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for (i = 0; i < NUM_FIELDS; i++)
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Z[i][0] = '?';
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/* read memory info */
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fp = xfopen_for_read("meminfo");
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while (fgets(linebuf, sizeof(linebuf), fp)) {
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char *p;
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#define SCAN(match, name) \
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p = grab_number(linebuf, match, sizeof(match)-1); \
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if (p) { name = p; continue; }
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SCAN("MemTotal:", total);
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SCAN("MemFree:", mfree);
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SCAN("Buffers:", buf);
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SCAN("Cached:", cache);
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SCAN("SwapTotal:", swaptotal);
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SCAN("SwapFree:", swapfree);
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SCAN("Dirty:", dirty);
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SCAN("Writeback:", mwrite);
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SCAN("AnonPages:", anon);
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SCAN("Mapped:", map);
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SCAN("Slab:", slab);
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#undef SCAN
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for (i = 0; i < NUM_FIELDS; i++) {
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unsigned sz = (unsigned char)match[i][0];
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if (strncmp(linebuf, match[i] + 1, sz) == 0) {
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/* Cut "NNNN" out of " NNNN kb" */
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char *s = skip_whitespace(linebuf + sz);
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skip_non_whitespace(s)[0] = '\0';
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safe_strncpy(Z[i], s, sizeof(Z[i]));
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break;
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}
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}
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}
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fclose(fp);
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#define S(s) (s ? s : "0")
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snprintf(linebuf, sizeof(linebuf),
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"Mem total:%s anon:%s map:%s free:%s",
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S(total), S(anon), S(map), S(mfree));
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Z[TOTAL], Z[ANON], Z[MAP], Z[MFREE]);
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printf(OPT_BATCH_MODE ? "%.*s\n" : "\033[H\033[J%.*s\n", scr_width, linebuf);
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snprintf(linebuf, sizeof(linebuf),
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" slab:%s buf:%s cache:%s dirty:%s write:%s",
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S(slab), S(buf), S(cache), S(dirty), S(mwrite));
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Z[SLAB], Z[BUF], Z[CACHE], Z[DIRTY], Z[MWRITE]);
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printf("%.*s\n", scr_width, linebuf);
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snprintf(linebuf, sizeof(linebuf),
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"Swap total:%s free:%s", // TODO: % used?
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S(swaptotal), S(swapfree));
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Z[SWAPTOTAL], Z[SWAPFREE]);
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printf("%.*s\n", scr_width, linebuf);
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(*lines_rem_p) -= 3;
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#undef S
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for (i = 0; i < ARRAY_SIZE(str); i++)
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free(str[i]);
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#undef total
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#undef free
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#undef buf
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#undef cache
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#undef swaptotal
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#undef swapfree
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#undef dirty
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#undef write
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#undef anon
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#undef map
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#undef slab
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#undef str
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}
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static void ulltoa6_and_space(unsigned long long ul, char buf[6])
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