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find: implement -empty

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function                                             old     new   delta
func_empty                                             -     121    +121
packed_usage                                       33154   33167     +13
parse_params                                        1490    1500     +10
static.params                                        228     235      +7
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(add/remove: 1/0 grow/shrink: 3/0 up/down: 151/0)             Total: 151 bytes

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Aaro Koskinen 2019-09-12 12:04:13 +02:00 committed by Denys Vlasenko
parent d327c6b190
commit af18b301eb
1 changed files with 44 additions and 0 deletions
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44
findutils/find.c
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@ -203,6 +203,14 @@
//config: WARNING: This option can do much harm if used wrong. Busybox will not
//config: try to protect the user from doing stupid things. Use with care.
//config:
//config:config FEATURE_FIND_EMPTY
//config: bool "Enable -empty: match empty files or directories"
//config: default y
//config: depends on FIND
//config: help
//config: Support the 'find -empty' option to find empty regular files
//config: or directories.
//config:
//config:config FEATURE_FIND_PATH
//config: bool "Enable -path: match pathname with shell pattern"
//config: default y
@ -315,6 +323,9 @@
//usage: IF_FEATURE_FIND_CONTEXT(
//usage: "\n -context CTX File has specified security context"
//usage: )
//usage: IF_FEATURE_FIND_EMPTY(
//usage: "\n -empty Match empty file/directory"
//usage: )
//usage: IF_FEATURE_FIND_PRUNE(
//usage: "\n -prune If current file is directory, don't descend into it"
//usage: )
@ -396,6 +407,7 @@ IF_FEATURE_FIND_PAREN( ACTS(paren, action ***subexpr;))
IF_FEATURE_FIND_PRUNE( ACTS(prune))
IF_FEATURE_FIND_QUIT( ACTS(quit))
IF_FEATURE_FIND_DELETE( ACTS(delete))
IF_FEATURE_FIND_EMPTY( ACTS(empty))
IF_FEATURE_FIND_EXEC( ACTS(exec,
char **exec_argv; /* -exec ARGS */
unsigned *subst_count;
@ -824,6 +836,30 @@ ACTF(delete)
return TRUE;
}
#endif
#if ENABLE_FEATURE_FIND_EMPTY
ACTF(empty)
{
if (S_ISDIR(statbuf->st_mode)) {
DIR *dir;
struct dirent *dent;
dir = opendir(fileName);
if (!dir) {
bb_simple_perror_msg(fileName);
return FALSE;
}
while ((dent = readdir(dir)) != NULL
&& DOT_OR_DOTDOT(dent->d_name)
) {
continue;
}
closedir(dir);
return dent == NULL;
}
return S_ISREG(statbuf->st_mode) && statbuf->st_size == 0;
}
#endif
#if ENABLE_FEATURE_FIND_CONTEXT
ACTF(context)
{
@ -989,6 +1025,7 @@ static action*** parse_params(char **argv)
IF_FEATURE_FIND_PRUNE( PARM_prune ,)
IF_FEATURE_FIND_QUIT( PARM_quit ,)
IF_FEATURE_FIND_DELETE( PARM_delete ,)
IF_FEATURE_FIND_EMPTY( PARM_empty ,)
IF_FEATURE_FIND_EXEC( PARM_exec ,)
IF_FEATURE_FIND_EXECUTABLE(PARM_executable,)
IF_FEATURE_FIND_PAREN( PARM_char_brace,)
@ -1034,6 +1071,7 @@ static action*** parse_params(char **argv)
IF_FEATURE_FIND_PRUNE( "-prune\0" )
IF_FEATURE_FIND_QUIT( "-quit\0" )
IF_FEATURE_FIND_DELETE( "-delete\0" )
IF_FEATURE_FIND_EMPTY( "-empty\0" )
IF_FEATURE_FIND_EXEC( "-exec\0" )
IF_FEATURE_FIND_EXECUTABLE("-executable\0")
IF_FEATURE_FIND_PAREN( "(\0" )
@ -1203,6 +1241,12 @@ static action*** parse_params(char **argv)
(void) ALLOC_ACTION(delete);
}
#endif
#if ENABLE_FEATURE_FIND_EMPTY
else if (parm == PARM_empty) {
dbg("%d", __LINE__);
(void) ALLOC_ACTION(empty);
}
#endif
#if ENABLE_FEATURE_FIND_EXEC
else if (parm == PARM_exec) {
int i;