Simple database: Difference between revisions
Content added Content deleted
m (→{{header|C}}: Fixed incomplete edit 155789 from 20 April 2013) |
(→{{header|C}}: As I wrote, previous version does not compile. Now all works fine.) |
||
| Line 64: | Line 64: | ||
sort_by(last_name); |
sort_by(last_name); |
||
sort_by(title); |
sort_by(title); |
||
static |
static int by_date(pdb_t *p1, pdb_t *p2); |
||
/* main */ |
/* main */ |
||
int main (int argc, char **argv) { |
int main (int argc, char **argv) { |
||
| Line 76: | Line 76: | ||
TRY (f=fopen(DB,"a+")); |
TRY (f=fopen(DB,"a+")); |
||
if (argc<2) { |
if (argc<2) { |
||
usage: printf ("Usage: %s [commands]\n" |
usage: printf ("Usage: %s [commands]\n" |
||
"-c Create new entry.\n" |
"-c Create new entry.\n" |
||
"-p Print the latest entry.\n" |
"-p Print the latest entry.\n" |
||
"-t Print all entries sorted by title.\n" |
"-t Print all entries sorted by title.\n" |
||
"-d Print all entries sorted by date.\n" |
"-d Print all entries sorted by date.\n" |
||
"-a Print all entries sorted by author.\n",argv[0]); |
"-a Print all entries sorted by author.\n",argv[0]); |
||
fclose (f); |
fclose (f); |
||
| Line 112: | Line 112: | ||
printf ("-d Print all entries sorted by date.\n"); |
printf ("-d Print all entries sorted by date.\n"); |
||
dblist = dao (READ,f,&db,NULL); |
dblist = dao (READ,f,&db,NULL); |
||
dblist = dao (SORT,f,dblist,by_date); |
dblist = dao (SORT,f,dblist,(int (*)(const void *,const void *)) by_date); |
||
dao (PRINT,f,dblist,NULL); |
dao (PRINT,f,dblist,NULL); |
||
dao (DESTROY,f,dblist,NULL); |
dao (DESTROY,f,dblist,NULL); |
||
| Line 191: | Line 191: | ||
qsort (pdb,i,sizeof in_db,sortby); |
qsort (pdb,i,sizeof in_db,sortby); |
||
pdb[i-1]->next=NULL; |
pdb[i-1]->next=NULL; |
||
for (;i;i--) { |
for (i=i-1;i;i--) { |
||
pdb[i-1]->next=pdb[i]; |
pdb[i-1]->next=pdb[i]; |
||
} |
} |
||
| Line 221: | Line 221: | ||
} |
} |
||
/* sort by date callback for qsort */ |
/* sort by date callback for qsort */ |
||
static int by_date ( |
static int by_date (pdb_t *p1, pdb_t *p2) { |
||
if ((*p1)->date < (*p2)->date) { |
|||
const pdb_t *p2 = b; |
|||
if ((*p1)->date < (*p2)->date) |
|||
return -1; |
return -1; |
||
} |
|||
else return ((*p1)->date > (*p2)->date); |
|||
}</lang> |
}</lang> |
||