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log_rotate function to fight the increasingly huge logfiles

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This commit is contained in:
Enno Rehling 2012-05-16 09:11:49 +02:00
parent b0959398d8
commit 21a49b1660
1 changed files with 30 additions and 1 deletions
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31
src/util/log.c
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@ -31,6 +31,7 @@ static int stdio_codepage = 0;
static FILE *logfile; static FILE *logfile;
#define MAXLENGTH 4096 /* because I am lazy, CP437 output is limited to this many chars */ #define MAXLENGTH 4096 /* because I am lazy, CP437 output is limited to this many chars */
#define LOG_MAXBACKUPS 5
void log_flush(void) void log_flush(void)
{ {
fflush(logfile); fflush(logfile);
@ -70,10 +71,38 @@ cp_convert(const char *format, char *buffer, size_t length, int codepage)
return 0; return 0;
} }
void log_rotate(const char *filename, int maxindex)
{
int n;
if (access(filename, R_OK)==0) {
char buffer[2][MAX_PATH];
int src = 1;
assert(strlen(filename)<sizeof(buffer[0])-4);
for(n=0;n<maxindex;++n) {
sprintf(buffer[0], "%s.%d", filename, n);
if (access(filename, R_OK)!=0) {
break;
}
}
if (access(buffer[0], R_OK)==0) {
unlink(buffer[0]);
}
while(n--) {
int dst = 1-src;
sprintf(buffer[src], "%s.%d", filename, n);
rename(buffer[src], buffer[dst]);
src=dst;
}
rename(filename, buffer[1-src]);
}
}
void log_open(const char *filename) void log_open(const char *filename)
{ {
if (logfile) if (logfile) {
log_close(); log_close();
}
log_rotate(filename, LOG_MAXBACKUPS);
logfile = fopen(filename, "a"); logfile = fopen(filename, "a");
if (logfile) { if (logfile) {
/* Get UNIX-style time and display as number and string. */ /* Get UNIX-style time and display as number and string. */