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sort: make sort -o FILE FILE (same FILE) work. Closes bug 785. -3 bytes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-12-13 02:09:22 +01:00
parent 31e2e7b863
commit aa42d13e32
2 changed files with 49 additions and 20 deletions
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54
coreutils/sort.c
View File

@ -278,27 +278,32 @@ static unsigned str2u(char **str)
int sort_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sort_main(int argc UNUSED_PARAM, char **argv)
{
FILE *fp, *outfile = stdout;
char *line, **lines = NULL;
char *line, **lines;
char *str_ignored, *str_o, *str_t;
llist_t *lst_k = NULL;
int i, flag;
int linecount = 0;
int linecount;
unsigned opts;
xfunc_error_retval = 2;
/* Parse command line options */
/* -o and -t can be given at most once */
opt_complementary = "o--o:t--t:" /* -t, -o: maximum one of each */
opt_complementary = "o--o:t--t:" /* -t, -o: at most one of each */
"k::"; /* -k takes list */
getopt32(argv, OPT_STR, &str_ignored, &str_ignored, &str_o, &lst_k, &str_t);
opts = getopt32(argv, OPT_STR, &str_ignored, &str_ignored, &str_o, &lst_k, &str_t);
/* global b strips leading and trailing spaces */
if (opts & FLAG_b)
option_mask32 |= FLAG_bb;
#if ENABLE_FEATURE_SORT_BIG
if (option_mask32 & FLAG_o) outfile = xfopen_for_write(str_o);
if (option_mask32 & FLAG_t) {
if (opts & FLAG_t) {
if (!str_t[0] || str_t[1])
bb_error_msg_and_die("bad -t parameter");
key_separator = str_t[0];
}
/* note: below this point we use option_mask32, not opts,
* since that reduces register pressure and makes code smaller */
/* parse sort key */
while (lst_k) {
enum {
@ -315,7 +320,6 @@ int sort_main(int argc UNUSED_PARAM, char **argv)
};
struct sort_key *key = add_key();
char *str_k = llist_pop(&lst_k);
const char *temp2;
i = 0; /* i==0 before comma, 1 after (-k3,6) */
while (*str_k) {
@ -327,6 +331,8 @@ int sort_main(int argc UNUSED_PARAM, char **argv)
key->range[2*i+1] = str2u(&str_k);
}
while (*str_k) {
const char *temp2;
if (*str_k == ',' && !i++) {
str_k++;
break;
@ -339,27 +345,29 @@ int sort_main(int argc UNUSED_PARAM, char **argv)
if (flag & ~FLAG_allowed_for_k)
bb_error_msg_and_die("unknown sort type");
/* b after ',' means strip _trailing_ space */
if (i && flag == FLAG_b) flag = FLAG_bb;
if (i && flag == FLAG_b)
flag = FLAG_bb;
key->flags |= flag;
str_k++;
}
}
}
#endif
/* global b strips leading and trailing spaces */
if (option_mask32 & FLAG_b) option_mask32 |= FLAG_bb;
/* Open input files and read data */
argv += optind;
if (!*argv)
*--argv = (char*)"-";
linecount = 0;
lines = NULL;
do {
/* coreutils 6.9 compat: abort on first open error,
* do not continue to next file: */
fp = xfopen_stdin(*argv);
FILE *fp = xfopen_stdin(*argv);
for (;;) {
line = GET_LINE(fp);
if (!line) break;
if (!line)
break;
lines = xrealloc_vector(lines, 6, linecount);
lines[linecount++] = line;
}
@ -373,16 +381,17 @@ int sort_main(int argc UNUSED_PARAM, char **argv)
/* handle -c */
if (option_mask32 & FLAG_c) {
int j = (option_mask32 & FLAG_u) ? -1 : 0;
for (i = 1; i < linecount; i++)
for (i = 1; i < linecount; i++) {
if (compare_keys(&lines[i-1], &lines[i]) > j) {
fprintf(stderr, "Check line %d\n", i);
fprintf(stderr, "Check line %u\n", i);
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
#endif
/* Perform the actual sort */
qsort(lines, linecount, sizeof(char *), compare_keys);
qsort(lines, linecount, sizeof(lines[0]), compare_keys);
/* handle -u */
if (option_mask32 & FLAG_u) {
flag = 0;
@ -390,17 +399,24 @@ int sort_main(int argc UNUSED_PARAM, char **argv)
/* -- disabling last-resort compare... */
option_mask32 |= FLAG_s;
for (i = 1; i < linecount; i++) {
if (!compare_keys(&lines[flag], &lines[i]))
if (compare_keys(&lines[flag], &lines[i]) == 0)
free(lines[i]);
else
lines[++flag] = lines[i];
}
if (linecount) linecount = flag+1;
if (linecount)
linecount = flag+1;
}
/* Print it */
#if ENABLE_FEATURE_SORT_BIG
/* Open output file _after_ we read all input ones */
if (option_mask32 & FLAG_o)
xmove_fd(xopen3(str_o, O_WRONLY, 0666), STDOUT_FILENO);
#endif
flag = (option_mask32 & FLAG_z) ? '\0' : '\n';
for (i = 0; i < linecount; i++)
fprintf(outfile, "%s%c", lines[i], flag);
printf("%s%c", lines[i], flag);
fflush_stdout_and_exit(EXIT_SUCCESS);
}

13
testsuite/sort.tests
View File

@ -27,6 +27,8 @@ egg 1 2 papyrus
999 3 0 algebra
"
# testing "description" "command(s)" "result" "infile" "stdin"
# Sorting with keys
testing "sort one key" "sort -k4,4 input" \
@ -115,4 +117,15 @@ one\0two\0three\0\
testing "sort key doesn't strip leading blanks, disables fallback global sort" \
"sort -n -k2 -t ' '" " a \n 1 \n 2 \n" "" " 2 \n 1 \n a \n"
testing "sort file in place" \
"strace -oZZZ sort -o input input && cat input" "\
111
222
" "\
222
111
" ""
# testing "description" "command(s)" "result" "infile" "stdin"
exit $FAILCOUNT