diff: shrink
function old new delta check 678 1607 +929 files_differ - 175 +175 do_diff 436 433 -3 asciifile 94 90 -4 print_only 23 16 -7 diff_main 868 842 -26 prepare 339 301 -38 print_status 316 178 -138 diffreg 2993 1818 -1175 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/7 up/down: 1104/-1391) Total: -287 bytes
This commit is contained in:
Denis Vlasenko
parent
c693840fe8
commit
dc1cbf839d
230
editors/diff.c
230
editors/diff.c
@ -14,14 +14,17 @@
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#include "libbb.h"
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#define FSIZE_MAX 32768
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// #define FSIZE_MAX 32768
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/* NOINLINEs added to prevent gcc from merging too much into diffreg()
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* (it bites more than it can (efficiently) chew). */
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/*
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* Output flags
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*/
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#define D_HEADER 1 /* Print a header/footer between files */
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#define D_EMPTY1 2 /* Treat first file as empty (/dev/null) */
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#define D_EMPTY2 4 /* Treat second file as empty (/dev/null) */
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#define D_HEADER 1 /* Print a header/footer between files */
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#define D_EMPTY1 2 /* Treat first file as empty (/dev/null) */
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#define D_EMPTY2 4 /* Treat second file as empty (/dev/null) */
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/*
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* Status values for print_status() and diffreg() return values
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@ -37,35 +40,33 @@
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* D_SKIPPED1 - skipped path1 as it is a special file
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* D_SKIPPED2 - skipped path2 as it is a special file
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*/
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#define D_SAME 0
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#define D_DIFFER (1<<0)
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#define D_BINARY (1<<1)
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#define D_COMMON (1<<2)
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#define D_ONLY (1<<3)
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#define D_MISMATCH1 (1<<4)
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#define D_MISMATCH2 (1<<5)
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#define D_ERROR (1<<6)
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#define D_SKIPPED1 (1<<7)
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#define D_SKIPPED2 (1<<8)
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#define D_SAME 0
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#define D_DIFFER (1 << 0)
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#define D_BINARY (1 << 1)
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#define D_COMMON (1 << 2)
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/*#define D_ONLY (1 << 3) - unused */
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#define D_MISMATCH1 (1 << 4)
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#define D_MISMATCH2 (1 << 5)
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#define D_ERROR (1 << 6)
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#define D_SKIPPED1 (1 << 7)
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#define D_SKIPPED2 (1 << 8)
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/* Command line options */
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#define FLAG_a (1<<0)
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#define FLAG_b (1<<1)
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#define FLAG_d (1<<2)
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#define FLAG_i (1<<3)
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#define FLAG_L (1<<4)
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#define FLAG_N (1<<5)
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#define FLAG_q (1<<6)
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#define FLAG_r (1<<7)
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#define FLAG_s (1<<8)
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#define FLAG_S (1<<9)
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#define FLAG_t (1<<10)
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#define FLAG_T (1<<11)
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#define FLAG_U (1<<12)
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#define FLAG_w (1<<13)
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#define FLAG_a (1 << 0)
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#define FLAG_b (1 << 1)
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#define FLAG_d (1 << 2)
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#define FLAG_i (1 << 3)
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#define FLAG_L (1 << 4)
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#define FLAG_N (1 << 5)
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#define FLAG_q (1 << 6)
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#define FLAG_r (1 << 7)
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#define FLAG_s (1 << 8)
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#define FLAG_S (1 << 9)
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#define FLAG_t (1 << 10)
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#define FLAG_T (1 << 11)
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#define FLAG_U (1 << 12)
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#define FLAG_w (1 << 13)
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#define g_read_buf bb_common_bufsiz1
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struct cand {
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int x;
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@ -90,13 +91,16 @@ struct context_vec {
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int d; /* end line in new file */
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};
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#define g_read_buf bb_common_bufsiz1
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struct globals {
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USE_FEATURE_DIFF_DIR(char **dl;)
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USE_FEATURE_DIFF_DIR(int dl_count;)
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int status;
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/* This is the default number of lines of context. */
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int context;
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size_t max_context;
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int status;
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char *start;
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const char *label1;
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const char *label2;
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@ -157,23 +161,25 @@ struct globals {
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} while (0)
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static void print_only(const char *path, size_t dirlen, const char *entry)
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/*static void print_only(const char *path, size_t dirlen, const char *entry)*/
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static void print_only(const char *path, const char *entry)
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{
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if (dirlen > 1)
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dirlen--;
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printf("Only in %.*s: %s\n", (int) dirlen, path, entry);
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printf("Only in %s: %s\n", path, entry);
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}
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static void print_status(int val, char *path1, char *path2, char *entry)
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/*static void print_status(int val, char *path1, char *path2, char *entry)*/
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static void print_status(int val, char *_path1, char *_path2)
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{
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const char *const _entry = entry ? entry : "";
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char * const _path1 = entry ? concat_path_file(path1, _entry) : path1;
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char * const _path2 = entry ? concat_path_file(path2, _entry) : path2;
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/*const char *const _entry = entry ? entry : "";*/
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/*char *const _path1 = entry ? concat_path_file(path1, _entry) : path1;*/
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/*char *const _path2 = entry ? concat_path_file(path2, _entry) : path2;*/
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switch (val) {
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case D_ONLY:
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print_only(path1, strlen(path1), entry);
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/* case D_ONLY:
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print_only(path1, entry);
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break;
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*/
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case D_COMMON:
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printf("Common subdirectories: %s and %s\n", _path1, _path2);
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break;
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@ -205,18 +211,23 @@ static void print_status(int val, char *path1, char *path2, char *entry)
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_path2);
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break;
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}
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/*
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if (entry) {
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free(_path1);
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free(_path2);
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}
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*/
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}
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/* Read line, return its nonzero hash. Return 0 if EOF.
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*
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* Hash function taken from Robert Sedgewick, Algorithms in C, 3d ed., p 578.
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*/
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static ALWAYS_INLINE int fiddle_sum(int sum, int t)
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{
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return sum * 127 + t;
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}
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/*
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* Hash function taken from Robert Sedgewick, Algorithms in C, 3d ed., p 578.
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*/
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static int readhash(FILE *fp)
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{
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int i, t, space;
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@ -224,32 +235,34 @@ static int readhash(FILE *fp)
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sum = 1;
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space = 0;
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i = 0;
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if (!(option_mask32 & (FLAG_b | FLAG_w))) {
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for (i = 0; (t = getc(fp)) != '\n'; i++) {
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while ((t = getc(fp)) != '\n') {
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if (t == EOF) {
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if (i == 0)
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return 0;
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break;
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}
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sum = fiddle_sum(sum, t);
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i = 1;
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}
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} else {
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for (i = 0;;) {
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while (1) {
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switch (t = getc(fp)) {
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case '\t':
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case '\r':
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case '\v':
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case '\f':
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case ' ':
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space++;
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space = 1;
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continue;
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default:
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if (space && !(option_mask32 & FLAG_w)) {
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i++;
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i = 1;
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space = 0;
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}
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sum = fiddle_sum(sum, t);
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i++;
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i = 1;
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continue;
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case EOF:
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if (i == 0)
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@ -273,7 +286,7 @@ static int readhash(FILE *fp)
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* Check to see if the given files differ.
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* Returns 0 if they are the same, 1 if different, and -1 on error.
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*/
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static int files_differ(FILE *f1, FILE *f2, int flags)
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static NOINLINE int files_differ(FILE *f1, FILE *f2, int flags)
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{
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size_t i, j;
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@ -288,7 +301,7 @@ static int files_differ(FILE *f1, FILE *f2, int flags)
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if (i != j)
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return 1;
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if (i == 0)
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return (ferror(f1) || ferror(f2));
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return (ferror(f1) || ferror(f2)) ? -1 : 0;
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if (memcmp(g_read_buf,
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g_read_buf + COMMON_BUFSIZE/2, i) != 0)
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return 1;
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@ -310,7 +323,7 @@ static void prepare(int i, FILE *fp /*, off_t filesize*/)
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p = xmalloc((sz + 3) * sizeof(p[0]));
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j = 0;
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while ((h = readhash(fp))) {
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while ((h = readhash(fp)) != 0) { /* while not EOF */
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if (j == sz) {
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sz = sz * 3 / 2;
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p = xrealloc(p, (sz + 3) * sizeof(p[0]));
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@ -433,13 +446,13 @@ static int stone(int *a, int n, int *b, int *c)
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int i, k, y, j, l;
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int oldc, tc, oldl;
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unsigned int numtries;
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#if ENABLE_FEATURE_DIFF_MINIMAL
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const unsigned int bound =
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(option_mask32 & FLAG_d) ? UINT_MAX : MAX(256, isqrt(n));
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#else
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const unsigned int bound = MAX(256, isqrt(n));
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#endif
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k = 0;
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c[0] = newcand(0, 0, 0);
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for (i = 1; i <= n; i++) {
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@ -500,7 +513,7 @@ static void unsort(struct line *f, int l, int *b)
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}
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static int skipline(FILE * f)
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static int skipline(FILE *f)
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{
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int i, c;
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@ -516,7 +529,7 @@ static int skipline(FILE * f)
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* to confounding by hashing (which result in "jackpot")
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* 2. collect random access indexes to the two files
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*/
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static void check(FILE * f1, FILE * f2)
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static NOINLINE void check(FILE *f1, FILE *f2)
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{
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int i, j, jackpot, c, d;
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long ctold, ctnew;
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@ -536,8 +549,7 @@ static void check(FILE * f1, FILE * f2)
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ixnew[j] = ctnew += skipline(f2);
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j++;
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}
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if ((option_mask32 & FLAG_b) || (option_mask32 & FLAG_w)
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|| (option_mask32 & FLAG_i)) {
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if (option_mask32 & (FLAG_b | FLAG_w | FLAG_i)) {
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while (1) {
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c = getc(f1);
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d = getc(f2);
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@ -545,8 +557,9 @@ static void check(FILE * f1, FILE * f2)
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* GNU diff ignores a missing newline
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* in one file if bflag || wflag.
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*/
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if (((option_mask32 & FLAG_b) || (option_mask32 & FLAG_w)) &&
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((c == EOF && d == '\n') || (c == '\n' && d == EOF))) {
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if ((option_mask32 & (FLAG_b | FLAG_w))
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&& ((c == EOF && d == '\n') || (c == '\n' && d == EOF))
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) {
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break;
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}
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ctold++;
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@ -556,12 +569,14 @@ static void check(FILE * f1, FILE * f2)
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if (c == '\n')
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break;
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ctold++;
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} while (isspace(c = getc(f1)));
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c = getc(f1);
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} while (isspace(c));
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do {
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if (d == '\n')
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break;
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ctnew++;
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} while (isspace(d = getc(f2)));
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d = getc(f2);
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} while (isspace(d));
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} else if (option_mask32 & FLAG_w) {
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while (isspace(c) && c != '\n') {
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c = getc(f1);
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@ -594,6 +609,7 @@ static void check(FILE * f1, FILE * f2)
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J[i] = 0;
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if (c != '\n' && c != EOF)
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ctold += skipline(f1);
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// BUG? Should be "if (d != '\n' && d != EOF)" ?
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if (d != '\n' && c != EOF)
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ctnew += skipline(f2);
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break;
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@ -628,9 +644,11 @@ static void sort(struct line *a, int n)
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aim = &ai[m];
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if (aim < ai)
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break; /* wraparound */
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if (aim->value > ai[0].value ||
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(aim->value == ai[0].value && aim->serial > ai[0].serial))
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if (aim->value > ai[0].value
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|| (aim->value == ai[0].value && aim->serial > ai[0].serial)
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) {
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break;
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}
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w.value = ai[0].value;
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ai[0].value = aim->value;
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aim->value = w.value;
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@ -654,7 +672,7 @@ static void uni_range(int a, int b)
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}
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static void fetch(long *f, int a, int b, FILE * lb, int ch)
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static void fetch(long *f, int a, int b, FILE *lb, int ch)
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{
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int i, j, c, lastc, col, nc;
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@ -688,31 +706,31 @@ static void fetch(long *f, int a, int b, FILE * lb, int ch)
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}
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static int asciifile(FILE * f)
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#if ENABLE_FEATURE_DIFF_BINARY
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static int asciifile(FILE *f)
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{
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#if ENABLE_FEATURE_DIFF_BINARY
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int i, cnt;
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#endif
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if ((option_mask32 & FLAG_a) || f == NULL)
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if (option_mask32 & FLAG_a)
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return 1;
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#if ENABLE_FEATURE_DIFF_BINARY
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rewind(f);
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cnt = fread(g_read_buf, 1, COMMON_BUFSIZE, f);
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for (i = 0; i < cnt; i++) {
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if (!isprint(g_read_buf[i])
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&& !isspace(g_read_buf[i])) {
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&& !isspace(g_read_buf[i])
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) {
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return 0;
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}
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}
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#endif
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return 1;
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}
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#else
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#define asciifile(f) 1
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#endif
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/* dump accumulated "unified" diff changes */
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static void dump_unified_vec(FILE * f1, FILE * f2)
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static void dump_unified_vec(FILE *f1, FILE *f2)
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{
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struct context_vec *cvp = context_vec_start;
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int lowa, upb, lowc, upd;
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@ -756,6 +774,7 @@ static void dump_unified_vec(FILE * f1, FILE * f2)
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#if 0
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switch (ch) {
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case 'c':
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// fetch() seeks!
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fetch(ixold, lowa, a - 1, f1, ' ');
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fetch(ixold, a, b, f1, '-');
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fetch(ixnew, c, d, f2, '+');
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@ -808,8 +827,8 @@ static void print_header(const char *file1, const char *file2)
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* lines appended (beginning at b). If c is greater than d then there are
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* lines missing from the to file.
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*/
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static void change(char *file1, FILE * f1, char *file2, FILE * f2, int a,
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int b, int c, int d)
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static void change(char *file1, FILE *f1, char *file2, FILE *f2,
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int a, int b, int c, int d)
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{
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if ((a > b && c > d) || (option_mask32 & FLAG_q)) {
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anychange = 1;
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@ -833,12 +852,14 @@ static void change(char *file1, FILE * f1, char *file2, FILE * f2, int a,
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* Print the context/unidiff header first time through.
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*/
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print_header(file1, file2);
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} else if (a > context_vec_ptr->b + (2 * context) + 1 &&
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c > context_vec_ptr->d + (2 * context) + 1) {
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} else if (a > context_vec_ptr->b + (2 * context) + 1
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&& c > context_vec_ptr->d + (2 * context) + 1
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) {
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/*
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* If this change is more than 'context' lines from the
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* previous change, dump the record and reset it.
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*/
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// dump_unified_vec() seeks!
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dump_unified_vec(f1, f2);
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}
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context_vec_ptr++;
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@ -850,7 +871,7 @@ static void change(char *file1, FILE * f1, char *file2, FILE * f2, int a,
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}
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static void output(char *file1, FILE * f1, char *file2, FILE * f2)
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static void output(char *file1, FILE *f1, char *file2, FILE *f2)
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{
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/* Note that j0 and j1 can't be used as they are defined in math.h.
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* This also allows the rather amusing variable 'j00'... */
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@ -870,12 +891,15 @@ static void output(char *file1, FILE * f1, char *file2, FILE * f2)
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i1++;
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j01 = J[i1 + 1] - 1;
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J[i1] = j01;
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// change() seeks!
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change(file1, f1, file2, f2, i0, i1, j00, j01);
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}
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if (m == 0) {
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// change() seeks!
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change(file1, f1, file2, f2, 1, 0, 1, len[1]);
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}
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if (anychange != 0 && !(option_mask32 & FLAG_q)) {
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// dump_unified_vec() seeks!
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dump_unified_vec(f1, f2);
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}
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}
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@ -887,12 +911,12 @@ static void output(char *file1, FILE * f1, char *file2, FILE * f2)
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*
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* The major goal is to generate the match vector J.
|
||||
* J[i] is the index of the line in file1 corresponding
|
||||
* to line i file0. J[i] = 0 if there is no
|
||||
* to line i in file0. J[i] = 0 if there is no
|
||||
* such line in file1.
|
||||
*
|
||||
* Lines are hashed so as to work in core. All potential
|
||||
* matches are located by sorting the lines of each file
|
||||
* on the hash (called ``value''). In particular, this
|
||||
* on the hash (called "value"). In particular, this
|
||||
* collects the equivalence classes in file1 together.
|
||||
* Subroutine equiv replaces the value of each line in
|
||||
* file0 by the index of the first element of its
|
||||
@ -908,7 +932,7 @@ static void output(char *file1, FILE * f1, char *file2, FILE * f2)
|
||||
* The cleverness lies in routine stone. This marches
|
||||
* through the lines of file0, developing a vector klist
|
||||
* of "k-candidates". At step i a k-candidate is a matched
|
||||
* pair of lines x,y (x in file0 y in file1) such that
|
||||
* pair of lines x,y (x in file0, y in file1) such that
|
||||
* there is a common subsequence of length k
|
||||
* between the first i lines of file0 and the first y
|
||||
* lines of file1, but there is no such subsequence for
|
||||
@ -939,14 +963,13 @@ static void output(char *file1, FILE * f1, char *file2, FILE * f2)
|
||||
* allocating what is needed and reusing what is not.
|
||||
* The core requirements for problems larger than somewhat
|
||||
* are (in words) 2*length(file0) + length(file1) +
|
||||
* 3*(number of k-candidates installed), typically about
|
||||
* 3*(number of k-candidates installed), typically about
|
||||
* 6n words for files of length n.
|
||||
*/
|
||||
static unsigned diffreg(char *ofile1, char *ofile2, int flags)
|
||||
static unsigned diffreg(char *file1, char *file2, int flags)
|
||||
{
|
||||
char *file1 = ofile1;
|
||||
char *file2 = ofile2;
|
||||
FILE *f1 = stdin, *f2 = stdin;
|
||||
FILE *f1;
|
||||
FILE *f2;
|
||||
unsigned rval;
|
||||
int i;
|
||||
|
||||
@ -956,19 +979,19 @@ static unsigned diffreg(char *ofile1, char *ofile2, int flags)
|
||||
if (S_ISDIR(stb1.st_mode) != S_ISDIR(stb2.st_mode))
|
||||
return (S_ISDIR(stb1.st_mode) ? D_MISMATCH1 : D_MISMATCH2);
|
||||
|
||||
rval = D_SAME;
|
||||
|
||||
if (LONE_DASH(file1) && LONE_DASH(file2))
|
||||
goto closem;
|
||||
return D_SAME;
|
||||
|
||||
rval = D_SAME;
|
||||
|
||||
if (flags & D_EMPTY1)
|
||||
f1 = xfopen(bb_dev_null, "r");
|
||||
else if (NOT_LONE_DASH(file1))
|
||||
f1 = xfopen(file1, "r");
|
||||
else
|
||||
f1 = xfopen_stdin(file1);
|
||||
if (flags & D_EMPTY2)
|
||||
f2 = xfopen(bb_dev_null, "r");
|
||||
else if (NOT_LONE_DASH(file2))
|
||||
f2 = xfopen(file2, "r");
|
||||
else
|
||||
f2 = xfopen_stdin(file2);
|
||||
|
||||
/* We can't diff non-seekable stream - we use rewind(), fseek().
|
||||
* This can be fixed (volunteers?).
|
||||
@ -977,6 +1000,7 @@ static unsigned diffreg(char *ofile1, char *ofile2, int flags)
|
||||
* Check in main won't catch "diffing fifos buried in subdirectories"
|
||||
* failure scenario - not very likely in real life... */
|
||||
|
||||
/* Quick check whether they are different */
|
||||
i = files_differ(f1, f2, flags);
|
||||
if (i == 0)
|
||||
goto closem;
|
||||
@ -992,6 +1016,7 @@ static unsigned diffreg(char *ofile1, char *ofile2, int flags)
|
||||
goto closem;
|
||||
}
|
||||
|
||||
// Rewind inside!
|
||||
prepare(0, f1 /*, stb1.st_size*/);
|
||||
prepare(1, f2 /*, stb2.st_size*/);
|
||||
prune();
|
||||
@ -1021,7 +1046,9 @@ static unsigned diffreg(char *ofile1, char *ofile2, int flags)
|
||||
|
||||
ixold = xrealloc(ixold, (len[0] + 2) * sizeof(long));
|
||||
ixnew = xrealloc(ixnew, (len[1] + 2) * sizeof(long));
|
||||
// Rewind inside!
|
||||
check(f1, f2);
|
||||
// Rewind inside!
|
||||
output(file1, f1, file2, f2);
|
||||
|
||||
closem:
|
||||
@ -1032,10 +1059,6 @@ static unsigned diffreg(char *ofile1, char *ofile2, int flags)
|
||||
}
|
||||
fclose_if_not_stdin(f1);
|
||||
fclose_if_not_stdin(f2);
|
||||
if (file1 != ofile1)
|
||||
free(file1);
|
||||
if (file2 != ofile2)
|
||||
free(file2);
|
||||
return rval;
|
||||
}
|
||||
|
||||
@ -1086,7 +1109,7 @@ static void do_diff(char *dir1, char *path1, char *dir2, char *path2)
|
||||
else
|
||||
val = diffreg(fullpath1, fullpath2, flags);
|
||||
|
||||
print_status(val, fullpath1, fullpath2, NULL);
|
||||
print_status(val, fullpath1, fullpath2 /*, NULL*/);
|
||||
ret:
|
||||
free(fullpath1);
|
||||
free(fullpath2);
|
||||
@ -1097,7 +1120,8 @@ static void do_diff(char *dir1, char *path1, char *dir2, char *path2)
|
||||
#if ENABLE_FEATURE_DIFF_DIR
|
||||
/* This function adds a filename to dl, the directory listing. */
|
||||
static int add_to_dirlist(const char *filename,
|
||||
struct stat ATTRIBUTE_UNUSED * sb, void *userdata,
|
||||
struct stat ATTRIBUTE_UNUSED *sb,
|
||||
void *userdata,
|
||||
int depth ATTRIBUTE_UNUSED)
|
||||
{
|
||||
/* +2: with space for eventual trailing NULL */
|
||||
@ -1160,7 +1184,6 @@ static void diffdir(char *p1, char *p2)
|
||||
*dp2 = '\0';
|
||||
|
||||
/* Get directory listings for p1 and p2. */
|
||||
|
||||
dirlist1 = get_dir(p1);
|
||||
dirlist2 = get_dir(p2);
|
||||
|
||||
@ -1190,13 +1213,13 @@ static void diffdir(char *p1, char *p2)
|
||||
if (option_mask32 & FLAG_N)
|
||||
do_diff(p1, dp1, p2, NULL);
|
||||
else
|
||||
print_only(p1, strlen(p1) + 1, dp1);
|
||||
print_only(p1, dp1);
|
||||
dirlist1++;
|
||||
} else {
|
||||
if (option_mask32 & FLAG_N)
|
||||
do_diff(p1, NULL, p2, dp2);
|
||||
else
|
||||
print_only(p2, strlen(p2) + 1, dp2);
|
||||
print_only(p2, dp2);
|
||||
dirlist2++;
|
||||
}
|
||||
}
|
||||
@ -1237,7 +1260,6 @@ int diff_main(int argc ATTRIBUTE_UNUSED, char **argv)
|
||||
* Do sanity checks, fill in stb1 and stb2 and call the appropriate
|
||||
* driver routine. Both drivers use the contents of stb1 and stb2.
|
||||
*/
|
||||
|
||||
f1 = argv[0];
|
||||
f2 = argv[1];
|
||||
if (LONE_DASH(f1)) {
|
||||
@ -1272,7 +1294,7 @@ int diff_main(int argc ATTRIBUTE_UNUSED, char **argv)
|
||||
* This can be fixed (volunteers?) */
|
||||
if (!S_ISREG(stb1.st_mode) || !S_ISREG(stb2.st_mode))
|
||||
bb_error_msg_and_die("can't diff non-seekable stream");
|
||||
print_status(diffreg(f1, f2, 0), f1, f2, NULL);
|
||||
print_status(diffreg(f1, f2, 0), f1, f2 /*, NULL*/);
|
||||
}
|
||||
return status;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user