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Fix statistics for empty databases

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An empty database is a database which does not contain any filenames.
It should not occur in practice but maybe in the case of an error.

echo | /usr/libexec/locate.mklocatedb > empty.db; locate -d empty.db -S
This commit is contained in:
Wolfram Schneider 2022-01-31 17:03:08 +00:00
parent 90be4091a7
commit 8d35ca86c5
1 changed files with 9 additions and 7 deletions
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16
usr.bin/locate/locate/fastfind.c
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@ -44,7 +44,7 @@ statistic (fp, path_fcodes)
FILE *fp; /* open database */
char *path_fcodes; /* for error message */
{
long lines, chars, size, big, zwerg, umlaut;
long lines, chars, size, size_nbg, big, zwerg, umlaut;
u_char *p, *s;
int c;
int count, longest_path;
@ -95,19 +95,21 @@ statistic (fp, path_fcodes)
longest_path = p - path;
}
/* size without bigram db */
size_nbg = size - (2 * NBG);
(void)printf("\nDatabase: %s\n", path_fcodes);
(void)printf("Compression: Front: %2.2f%%, ",
(size + big - (2 * NBG)) / (chars / (float)100));
(void)printf("Bigram: %2.2f%%, ", (size - big) / (size / (float)100));
(void)printf("Total: %2.2f%%\n",
(size - (2 * NBG)) / (chars / (float)100));
(void)printf("Compression: Front: %2.2f%%, ", chars > 0 ? (size_nbg + big) / (chars / (float)100) : 0);
(void)printf("Bigram: %2.2f%%, ", big > 0 ? (size_nbg - big) / (size_nbg / (float)100) : 0);
/* incl. bigram db overhead */
(void)printf("Total: %2.2f%%\n", chars > 0 ? size / (chars / (float)100) : 0);
(void)printf("Filenames: %ld, ", lines);
(void)printf("Characters: %ld, ", chars);
(void)printf("Database size: %ld\n", size);
(void)printf("Bigram characters: %ld, ", big);
(void)printf("Integers: %ld, ", zwerg);
(void)printf("8-Bit characters: %ld\n", umlaut);
printf("Longest path: %d\n", longest_path - 1);
printf("Longest path: %d\n", longest_path > 0 ? longest_path - 1 : 0);
/* non zero exit on corrupt database */
if (error)