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authorDenis Vlasenko2008-07-15 06:45:14 +0000
committerDenis Vlasenko2008-07-15 06:45:14 +0000
commitbb13079c8e9ca7bd86193a220baae1befb053fd6 (patch)
tree81b489bcc56d1fb12d30ae05adcb68d2acc59288 /coreutils/comm.c
parent51f1b6c0e0160a3c836bc6700c3fa2a43601dfac (diff)
downloadbusybox-bb13079c8e9ca7bd86193a220baae1befb053fd6.zip
busybox-bb13079c8e9ca7bd86193a220baae1befb053fd6.tar.gz
comm: almost total rewrite; add testsuite
function old new delta writeline 128 125 -3 comm_main 540 239 -301 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-304) Total: -304 bytes
Diffstat (limited to 'coreutils/comm.c')
-rw-r--r--coreutils/comm.c95
1 files changed, 41 insertions, 54 deletions
diff --git a/coreutils/comm.c b/coreutils/comm.c
index b62c987..221cbfb 100644
--- a/coreutils/comm.c
+++ b/coreutils/comm.c
@@ -14,8 +14,9 @@
#define COMM_OPT_3 (1 << 2)
/* writeline outputs the input given, appropriately aligned according to class */
-static void writeline(char *line, int class, int flags)
+static void writeline(char *line, int class)
{
+ int flags = option_mask32;
if (class == 0) {
if (flags & COMM_OPT_1)
return;
@@ -32,81 +33,67 @@ static void writeline(char *line, int class, int flags)
if (!(flags & COMM_OPT_2))
putchar('\t');
}
- fputs(line, stdout);
+ puts(line);
}
int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int comm_main(int argc UNUSED_PARAM, char **argv)
{
-#define LINE_LEN 100
-#define BB_EOF_0 0x1
-#define BB_EOF_1 0x2
- char thisline[2][LINE_LEN];
- FILE *streams[2];
+ char *thisline[2];
+ FILE *stream[2];
int i;
- unsigned flags;
+ int order;
opt_complementary = "=2";
- flags = getopt32(argv, "123");
+ getopt32(argv, "123");
argv += optind;
for (i = 0; i < 2; ++i) {
- streams[i] = (argv[i][0] == '-' && !argv[i][1]) ? stdin : xfopen(argv[i], "r");
- fgets(thisline[i], LINE_LEN, streams[i]);
+ stream[i] = xfopen_stdin(argv[i]);
}
- /* This is the real core of the program - lines are compared here */
-
- while (*thisline[0] || *thisline[1]) {
- int order = 0;
-
- i = 0;
- if (feof(streams[0])) i |= BB_EOF_0;
- if (feof(streams[1])) i |= BB_EOF_1;
-
- if (!*thisline[0])
- order = 1;
- else if (!*thisline[1])
- order = -1;
- else {
- int tl0_len, tl1_len;
- tl0_len = strlen(thisline[0]);
- tl1_len = strlen(thisline[1]);
- order = memcmp(thisline[0], thisline[1], tl0_len < tl1_len ? tl0_len : tl1_len);
- if (!order)
- order = tl0_len < tl1_len ? -1 : tl0_len != tl1_len;
+ order = 0;
+ thisline[1] = thisline[0] = NULL;
+ while (1) {
+ if (order <= 0) {
+ free(thisline[0]);
+ thisline[0] = xmalloc_fgetline(stream[0]);
+ }
+ if (order >= 0) {
+ free(thisline[1]);
+ thisline[1] = xmalloc_fgetline(stream[1]);
}
- if (order == 0 && !i)
- writeline(thisline[1], 2, flags);
- else if (order > 0 && !(i & BB_EOF_1))
- writeline(thisline[1], 1, flags);
- else if (order < 0 && !(i & BB_EOF_0))
- writeline(thisline[0], 0, flags);
-
- if (i & BB_EOF_0 & BB_EOF_1) {
+ i = !thisline[0] + (!thisline[1] << 1);
+ if (i)
break;
+ order = strcmp(thisline[0], thisline[1]);
- } else if (i) {
- i = (i & BB_EOF_0 ? 1 : 0);
- while (!feof(streams[i])) {
- if ((order < 0 && i) || (order > 0 && !i))
- writeline(thisline[i], i, flags);
- fgets(thisline[i], LINE_LEN, streams[i]);
- }
- break;
+ if (order >= 0)
+ writeline(thisline[1], order ? 1 : 2);
+ else
+ writeline(thisline[0], 0);
+ }
- } else {
- if (order >= 0)
- fgets(thisline[1], LINE_LEN, streams[1]);
- if (order <= 0)
- fgets(thisline[0], LINE_LEN, streams[0]);
+ /* EOF at least on one of the streams */
+ i &= 1;
+ if (thisline[i]) {
+ /* stream[i] is not at EOF yet */
+ /* we did not print thisline[i] yet */
+ char *p = thisline[i];
+ writeline(p, i);
+ while (1) {
+ free(p);
+ p = xmalloc_fgetline(stream[i]);
+ if (!p)
+ break;
+ writeline(p, i);
}
}
if (ENABLE_FEATURE_CLEAN_UP) {
- fclose(streams[0]);
- fclose(streams[1]);
+ fclose(stream[0]);
+ fclose(stream[1]);
}
return EXIT_SUCCESS;