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#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <dirent.h>
#define TRUE (1)
#define FALSE (0)
typedef struct fn_stream {
FILE* file;
char line[1000];
} fn_stream;
typedef struct collection {
fn_stream* s[100];
int n;
} collection;
void next_line( fn_stream* s ) {
assert(s != NULL);
assert(s->file != NULL);
if ( NULL == fgets( s->line, 1000, s->file ) ) {
fclose(s->file);
s->file = NULL;
} else {
int x = strlen(s->line) - 1;
if ( s->line[x] == '\n' ) s->line[x] = '\0';
}
}
fn_stream* init_fn_stream( char* filename ) {
fn_stream* s = malloc( sizeof( fn_stream ) );
if ( !s ) return NULL;
s->file = fopen( filename, "r" );
if ( !s->file ) {
free(s);
return NULL;
}
next_line(s);
return s;
}
int find_least( collection* c ) {
int least = -1;
int i;
for ( i = 0; i < c->n; i++ ) {
if ( NULL == c->s[i]->file ) {
continue;
} else if ( least == -1 ) {
least = i;
} else {
int x = strcmp( c->s[least]->line, c->s[i]->line );
if ( x == 0 ) {
next_line(c->s[i]);
} else if ( x > 0 ) {
least = i;
}
}
}
return least;
}
void close_collection( collection* c ) {
int i;
for ( i = 0; i < c->n; i++ ) {
if ( c->s[i]->file ) fclose( c->s[i]->file );
free(c->s[i]);
}
c->n = 0;
}
int main(void) {
collection expl;
FILE* miss[100];
collection file;
FILE* unex[100];
collection need;
FILE* want[100];
int i;
char filename[1000];
DIR* spool_dir;
struct dirent* pde;
expl.n = 0;
file.n = 0;
need.n = 0;
spool_dir = opendir( "/var/spool/cruft" );
if ( spool_dir == NULL ) {
perror( "/var/spool/cruft" );
return 1;
}
chdir( "/var/spool/cruft" );
while( (pde = readdir( spool_dir )) ) {
if ( strncmp( pde->d_name, "expl_", 5 ) == 0 ) {
strcpy( filename, pde->d_name );
strncpy( filename, "miss", 4 );
miss[expl.n] = fopen( filename, "w" );
expl.s[expl.n++] = init_fn_stream( pde->d_name );
} else if ( strncmp( pde->d_name, "file_", 5 ) == 0 ) {
strcpy( filename, pde->d_name );
strncpy( filename, "unex", 4 );
unex[file.n] = fopen( filename, "w" );
file.s[file.n++] = init_fn_stream( pde->d_name );
} else if ( strncmp( pde->d_name, "need_", 5 ) == 0 ) {
strcpy( filename, pde->d_name );
strncpy( filename, "want", 4 );
want[need.n] = fopen( filename, "w" );
need.s[need.n++] = init_fn_stream( pde->d_name );
}
}
closedir(spool_dir);
for(;;) {
int least_expl = find_least( &expl );
int least_file = find_least( &file );
int least_need = find_least( &need );
int x[3];
int y;
if ( least_expl < 0 && least_file < 0 && least_need < 0 ) break;
x[0] = least_expl >= 0;
x[1] = least_file >= 0;
x[2] = least_need >= 0;
if ( x[0] && x[1] ) {
y = strcmp( expl.s[least_expl]->line, file.s[least_file]->line );
if ( y < 0 ) {
x[1] = FALSE;
if ( x[2] ) {
y = strcmp( expl.s[least_expl]->line,
need.s[least_need]->line );
if ( y < 0 ) {
x[2] = FALSE;
} else if ( y > 0 ) {
x[0] = FALSE;
}
}
} else if ( y > 0 ) {
x[0] = FALSE;
if ( x[2] ) {
y = strcmp( file.s[least_file]->line,
need.s[least_need]->line );
if ( y < 0 ) {
x[2] = FALSE;
} else if ( y > 0 ) {
x[1] = FALSE;
}
}
} else {
if ( x[2] ) {
y = strcmp( expl.s[least_expl]->line,
need.s[least_need]->line );
if ( y < 0 ) {
x[2] = FALSE;
} else if ( y > 0 ) {
x[0] = FALSE;
x[1] = FALSE;
}
}
}
}
assert(x[0] || x[1] || x[2]);
assert( !x[0] || least_expl >= 0 );
assert( !x[1] || least_file >= 0 );
assert( !x[2] || least_need >= 0 );
#if 0
fprintf( stderr, "%c%c%c %s (%s %s %s)\n",
x[0] ? '*' : '-',
x[1] ? '*' : '-',
x[2] ? '*' : '-',
x[0] ? expl.s[least_expl]->line :
x[1] ? file.s[least_file]->line :
need.s[least_need]->line,
least_expl >= 0 ? expl.s[least_expl]->line : "(eof)",
least_file >= 0 ? file.s[least_file]->line : "(eof)",
least_need >= 0 ? need.s[least_need]->line : "(eof)"
);
#endif
if ( x[0] && !x[1] ) { /* explained, but not there */
fprintf( miss[least_expl], "%s\n", expl.s[least_expl]->line );
}
if ( x[1] && !x[0] ) { /* there, but not explained */
fprintf( unex[least_file], "%s\n", file.s[least_file]->line );
}
if ( x[2] && !x[1] ) { /* needed but not there */
fprintf( want[least_need], "%s\n", need.s[least_need]->line );
}
if ( x[0] ) next_line( expl.s[least_expl] );
if ( x[1] ) next_line( file.s[least_file] );
if ( x[2] ) next_line( need.s[least_need] );
}
for ( i = 0; i < expl.n; i++ ) fclose( miss[i] );
close_collection(&expl);
for ( i = 0; i < file.n; i++ ) fclose( unex[i] );
close_collection(&file);
for ( i = 0; i < need.n; i++ ) fclose( want[i] );
close_collection(&need);
return 0;
}
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