libbb: shrink sump.c
function old new delta dot_flags_width_chars - 16 +16 int_convs - 7 +7 lcc 7 - -7 index_str 16 - -16 rewrite 1013 937 -76 ------------------------------------------------------------------------------ (add/remove: 2/2 grow/shrink: 0/1 up/down: 23/-99) Total: -76 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
b13b618335
commit
cb8e84e65a
145
libbb/dump.c
145
libbb/dump.c
@ -14,12 +14,12 @@
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#include "libbb.h"
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#include "dump.h"
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static const char index_str[] ALIGN1 = ".#-+ 0123456789";
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static const char dot_flags_width_chars[] ALIGN1 = ".#-+ 0123456789";
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static const char size_conv_str[] ALIGN1 =
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"\x1\x4\x4\x4\x4\x4\x4\x8\x8\x8\x8\010cdiouxXeEfgG";
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static const char lcc[] ALIGN1 = "diouxX";
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static const char int_convs[] ALIGN1 = "diouxX";
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typedef struct priv_dumper_t {
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@ -71,7 +71,7 @@ static NOINLINE int bb_dump_size(FS *fs)
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* skip any special chars -- save precision in
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* case it's a %s format.
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*/
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while (strchr(index_str + 1, *++fmt))
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while (strchr(dot_flags_width_chars + 1, *++fmt))
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continue;
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if (*fmt == '.' && isdigit(*++fmt)) {
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prec = atoi(fmt);
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@ -82,14 +82,15 @@ static NOINLINE int bb_dump_size(FS *fs)
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if (!p) {
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if (*fmt == 's') {
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bcnt += prec;
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} else if (*fmt == '_') {
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}
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if (*fmt == '_') {
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++fmt;
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if ((*fmt == 'c') || (*fmt == 'p') || (*fmt == 'u')) {
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bcnt += 1;
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}
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}
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} else {
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bcnt += size_conv_str[p - (size_conv_str + 12)];
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bcnt += p[-12];
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}
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}
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cur_size += bcnt * fu->reps;
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@ -99,32 +100,30 @@ static NOINLINE int bb_dump_size(FS *fs)
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static NOINLINE void rewrite(priv_dumper_t *dumper, FS *fs)
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{
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enum { NOTOKAY, USEBCNT, USEPREC } sokay;
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FU *fu;
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PR *pr;
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char *p1, *p2, *p3;
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char savech, *fmtp;
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const char *byte_count_str;
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int nconv, prec = 0;
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for (fu = fs->nextfu; fu; fu = fu->nextfu) {
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PR *pr;
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char *p1, *p2, *p3;
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char *fmtp;
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int nconv = 0;
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/*
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* break each format unit into print units; each
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* conversion character gets its own.
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*/
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for (nconv = 0, fmtp = fu->fmt; *fmtp; ) {
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/* NOSTRICT */
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for (fmtp = fu->fmt; *fmtp; ) {
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unsigned len;
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const char *prec;
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const char *byte_count_str;
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/* DBU:[dvae@cray.com] zalloc so that forward ptrs start out NULL */
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pr = xzalloc(sizeof(PR));
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pr = xzalloc(sizeof(*pr));
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if (!fu->nextpr)
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fu->nextpr = pr;
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/* skip preceding text and up to the next % sign */
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for (p1 = fmtp; *p1 && *p1 != '%'; ++p1)
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continue;
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/* only text in the string */
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if (!*p1) {
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p1 = strchr(fmtp, '%');
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if (!p1) { /* only text in the string */
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pr->fmt = fmtp;
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pr->flags = F_TEXT;
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break;
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@ -134,22 +133,20 @@ static NOINLINE void rewrite(priv_dumper_t *dumper, FS *fs)
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* get precision for %s -- if have a byte count, don't
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* need it.
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*/
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prec = NULL;
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if (fu->bcnt) {
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sokay = USEBCNT;
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/* skip to conversion character */
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for (++p1; strchr(index_str, *p1); ++p1)
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while (strchr(dot_flags_width_chars, *++p1))
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continue;
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} else {
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/* skip any special chars, field width */
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while (strchr(index_str + 1, *++p1))
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while (strchr(dot_flags_width_chars + 1, *++p1))
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continue;
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if (*p1 == '.' && isdigit(*++p1)) {
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sokay = USEPREC;
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prec = atoi(p1);
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prec = p1;
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while (isdigit(*++p1))
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continue;
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} else
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sokay = NOTOKAY;
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}
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}
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p2 = p1 + 1; /* set end pointer */
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@ -174,63 +171,63 @@ static NOINLINE void rewrite(priv_dumper_t *dumper, FS *fs)
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}
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/* Unlike the original, output the remainder of the format string. */
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pr->bcnt = *byte_count_str;
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} else if (*p1 == 'l') {
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} else
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if (*p1 == 'l') { /* %ld etc */
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const char *e;
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++p2;
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++p1;
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DO_INT_CONV:
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{
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const char *e;
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e = strchr(lcc, *p1);
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if (!e) {
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e = strchr(int_convs, *p1); /* "diouxX"? */
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if (!e)
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goto DO_BAD_CONV_CHAR;
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}
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pr->flags = F_INT;
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if (e > lcc + 1) {
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if (e > int_convs + 1) /* not d or i? */
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pr->flags = F_UINT;
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}
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byte_count_str = "\004\002\001";
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goto DO_BYTE_COUNT;
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}
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/* NOTREACHED */
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} else if (strchr(lcc, *p1)) {
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} else
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if (strchr(int_convs, *p1)) { /* %d etc */
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goto DO_INT_CONV;
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} else if (strchr("eEfgG", *p1)) {
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} else
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if (strchr("eEfgG", *p1)) { /* floating point */
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pr->flags = F_DBL;
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byte_count_str = "\010\004";
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goto DO_BYTE_COUNT;
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} else if (*p1 == 's') {
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} else
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if (*p1 == 's') {
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pr->flags = F_STR;
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if (sokay == USEBCNT) {
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pr->bcnt = fu->bcnt;
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} else if (sokay == USEPREC) {
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pr->bcnt = prec;
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} else { /* NOTOKAY */
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bb_error_msg_and_die("%%s requires a precision or a byte count");
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if (fu->bcnt == 0) {
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if (!prec)
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bb_error_msg_and_die("%%s needs precision or byte count");
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pr->bcnt = atoi(prec);
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}
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} else if (*p1 == '_') {
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++p2;
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} else
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if (*p1 == '_') {
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p2++; /* move past a in "%_a" */
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switch (p1[1]) {
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case 'A':
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case 'A': /* %_A[dox]: print address and the end */
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dumper->endfu = fu;
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fu->flags |= F_IGNORE;
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/* FALLTHROUGH */
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case 'a':
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case 'a': /* %_a[dox]: current address */
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pr->flags = F_ADDRESS;
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++p2;
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p2++; /* move past x in "%_ax" */
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if ((p1[2] != 'd') && (p1[2] != 'o') && (p1[2] != 'x')) {
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goto DO_BAD_CONV_CHAR;
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}
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*p1 = p1[2];
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break;
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case 'c':
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case 'c': /* %_c: chars, \ooo, \n \r \t etc */
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pr->flags = F_C;
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/* *p1 = 'c'; set in conv_c */
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goto DO_BYTE_COUNT_1;
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case 'p':
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case 'p': /* %_p: chars, dots for nonprintable */
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pr->flags = F_P;
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*p1 = 'c';
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goto DO_BYTE_COUNT_1;
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case 'u':
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case 'u': /* %_p: chars, 'nul', 'esc' etc for nonprintable */
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pr->flags = F_U;
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/* *p1 = 'c'; set in conv_u */
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goto DO_BYTE_COUNT_1;
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@ -246,13 +243,8 @@ static NOINLINE void rewrite(priv_dumper_t *dumper, FS *fs)
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* copy to PR format string, set conversion character
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* pointer, update original.
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*/
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savech = *p2;
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p1[1] = '\0';
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pr->fmt = xstrdup(fmtp);
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*p2 = savech;
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//Too early! xrealloc can move pr->fmt!
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//pr->cchar = pr->fmt + (p1 - fmtp);
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len = (p1 - fmtp) + 1;
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pr->fmt = xstrndup(fmtp, len);
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/* DBU:[dave@cray.com] w/o this, trailing fmt text, space is lost.
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* Skip subsequent text and up to the next % sign and tack the
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* additional text onto fmt: eg. if fmt is "%x is a HEX number",
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@ -260,16 +252,17 @@ static NOINLINE void rewrite(priv_dumper_t *dumper, FS *fs)
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*/
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for (p3 = p2; *p3 && *p3 != '%'; p3++)
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continue;
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if (p3 > p2) {
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savech = *p3;
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*p3 = '\0';
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pr->fmt = xrealloc(pr->fmt, strlen(pr->fmt) + (p3-p2) + 1);
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strcat(pr->fmt, p2);
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*p3 = savech;
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p2 = p3;
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if ((p3 - p2) != 0) {
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char *d;
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pr->fmt = d = xrealloc(pr->fmt, len + (p3 - p2) + 1);
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d += len;
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do {
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*d++ = *p2++;
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} while (p2 != p3);
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*d = '\0';
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/* now p2 = p3 */
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}
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pr->cchar = pr->fmt + (p1 - fmtp);
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pr->cchar = pr->fmt + len - 1; /* must be after realloc! */
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fmtp = p2;
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/* only one conversion character if byte count */
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@ -281,7 +274,7 @@ static NOINLINE void rewrite(priv_dumper_t *dumper, FS *fs)
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* if format unit byte count not specified, figure it out
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* so can adjust rep count later.
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*/
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if (!fu->bcnt)
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if (fu->bcnt == 0)
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for (pr = fu->nextpr; pr; pr = pr->nextpr)
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fu->bcnt += pr->bcnt;
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}
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@ -303,16 +296,18 @@ static NOINLINE void rewrite(priv_dumper_t *dumper, FS *fs)
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fu->reps += (dumper->blocksize - fs->bcnt) / fu->bcnt;
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}
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if (fu->reps > 1 && fu->nextpr) {
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PR *pr;
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char *p1, *p2;
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for (pr = fu->nextpr;; pr = pr->nextpr)
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if (!pr->nextpr)
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break;
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for (p1 = pr->fmt, p2 = NULL; *p1; ++p1)
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p2 = NULL;
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for (p1 = pr->fmt; *p1; ++p1)
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p2 = isspace(*p1) ? p1 : NULL;
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if (p2)
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pr->nospace = p2;
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}
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if (!fu->nextfu)
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break;
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}
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}
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@ -356,6 +351,7 @@ static NOINLINE int next(priv_dumper_t *dumper)
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if (dumper->next__done)
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return 0; /* no next file */
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dumper->next__done = 1;
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//why stat of stdin is specially prohibited?
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statok = 0;
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}
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if (dumper->pub.dump_skip)
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@ -760,6 +756,11 @@ void FAST_FUNC bb_dump_add(dumper_t* pub_dumper, const char *fmt)
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if (!isspace(*p)) {
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bb_error_msg_and_die("bad format {%s}", fmt);
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}
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// Above check prohibits formats such as '/1"%02x"' - it requires space after 1.
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// Other than this, formats can be pretty much jammed together:
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// "%07_ax:"8/2 "%04x|""\n"
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// but this space is required. The check *can* be removed, but
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// keeping it to stay compat with util-linux hexdump.
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tfu->bcnt = atoi(savep);
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/* skip trailing white space */
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p = skip_whitespace(p + 1);
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