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find: fix -prune more. Add big comment about it.

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This commit is contained in:
Denis Vlasenko 2007-04-08 11:10:43 +00:00
parent bbd695d801
commit b04b4357ff
1 changed files with 21 additions and 7 deletions
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28
findutils/find.c
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@ -120,20 +120,34 @@ static int exec_actions(action ***appp, const char *fileName, struct stat *statb
{ {
int cur_group; int cur_group;
int cur_action; int cur_action;
int rc = TRUE; int rc = 0;
action **app, *ap; action **app, *ap;
/* "action group" is a set of actions ANDed together.
* groups are ORed together.
* We simply evaluate each group until we find one in which all actions
* succeed. */
/* -prune is special: if it is encountered, then we won't
* descend into current directory. It doesn't matter whether
* action group (in which -prune sits) will succeed or not:
* find * -prune -name 'f*' -o -name 'm*' -- prunes every dir
* find * -name 'f*' -o -prune -name 'm*' -- prunes all dirs
* not starting with 'f' */
/* We invert TRUE bit (bit 0). Now 1 there means 'failure'.
* and bitwise OR in "rc |= TRUE ^ ap->f()" will:
* (1) make SKIP (-prune) bit stick; and (2) detect 'failure'.
* On return, bit is restored. */
cur_group = -1; cur_group = -1;
while ((app = appp[++cur_group])) { while ((app = appp[++cur_group])) {
/* We invert TRUE bit (bit 0). Now 1 there means 'failure'. rc &= ~TRUE; /* 'success' so far, clear TRUE bit */
* and bitwise OR in "rc |= TRUE ^ ap->f()" will:
* (1) make SKIP bit stick; and (2) detect 'failure' */
rc = 0; /* 'success' so far */
cur_action = -1; cur_action = -1;
while (1) { while (1) {
ap = app[++cur_action]; ap = app[++cur_action];
if (!ap) /* all actions in group were successful */ if (!ap) /* all actions in group were successful */
return rc ^ TRUE; return rc ^ TRUE; /* restore TRUE bit */
rc |= TRUE ^ ap->f(fileName, statbuf, ap); rc |= TRUE ^ ap->f(fileName, statbuf, ap);
#if ENABLE_FEATURE_FIND_NOT #if ENABLE_FEATURE_FIND_NOT
if (ap->invert) rc ^= TRUE; if (ap->invert) rc ^= TRUE;
@ -142,7 +156,7 @@ static int exec_actions(action ***appp, const char *fileName, struct stat *statb
break; break;
} }
} }
return rc ^ TRUE; /* straighten things out */ return rc ^ TRUE; /* restore TRUE bit */
} }