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top: code shrink, -26 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
parent
87496aa081
commit
d94332f2b6
60
procps/top.c
60
procps/top.c
@ -103,11 +103,11 @@ struct globals {
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}; //FIX_ALIASING; - large code growth
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enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() do { \
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struct G_sizecheck { \
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char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
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}; \
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} while (0)
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struct BUG_bad_size {
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char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
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char BUG_line_buf_too_small[LINE_BUF_SIZE > 80 ? 1 : -1];
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};
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#define INIT_G() do { } while (0)
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#define top (G.top )
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#define ntop (G.ntop )
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#define sort_field (G.sort_field )
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@ -705,7 +705,7 @@ static void display_topmem_header(int scr_width, int *lines_rem_p)
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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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static const char match[NUM_FIELDS][12] = {
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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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@ -718,52 +718,46 @@ static void display_topmem_header(int scr_width, int *lines_rem_p)
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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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char meminfo_buf[4 * 1024];
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const char *Z[NUM_FIELDS];
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unsigned i;
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FILE *fp;
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int sz;
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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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Z[i] = "?";
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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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sz = open_read_close("meminfo", meminfo_buf, sizeof(meminfo_buf) - 1);
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if (sz >= 0) {
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char *p = meminfo_buf;
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meminfo_buf[sz] = '\0';
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/* Note that fields always appear in the match[] order */
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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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char *found = strstr(p, match[i] + 1);
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if (found) {
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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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char *s = skip_whitespace(found + match[i][0]);
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p = skip_non_whitespace(s);
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*p++ = '\0';
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Z[i] = s;
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}
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}
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}
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fclose(fp);
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snprintf(linebuf, sizeof(linebuf),
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snprintf(line_buf, LINE_BUF_SIZE,
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"Mem total:%s anon:%s map:%s free:%s",
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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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printf(OPT_BATCH_MODE ? "%.*s\n" : "\033[H\033[J%.*s\n", scr_width, line_buf);
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snprintf(linebuf, sizeof(linebuf),
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snprintf(line_buf, LINE_BUF_SIZE,
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" slab:%s buf:%s cache:%s dirty:%s write:%s",
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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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printf("%.*s\n", scr_width, line_buf);
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snprintf(linebuf, sizeof(linebuf),
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snprintf(line_buf, LINE_BUF_SIZE,
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"Swap total:%s free:%s", // TODO: % used?
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Z[SWAPTOTAL], Z[SWAPFREE]);
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printf("%.*s\n", scr_width, linebuf);
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printf("%.*s\n", scr_width, line_buf);
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(*lines_rem_p) -= 3;
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}
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