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src
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MUtil
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trimfile.c
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C/C++ Source or Header
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1990-01-10
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2KB
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106 lines
/*
* TRIMFILE file1 file2 .. filen -lines
*
* (C) Copyright 1989-1990 by Matthew Dillon, All Rights Reserved.
*
* Trims the specified files to the specified number of lines. Each
* file is read and the last N lines written back.
*
* Normally used to trim log files based on a crontab entry. If no
* -lines argument is given the file is trimmed to 100 lines.
*
* Each line may be up to 255 characters in length.
*/
#include <stdio.h>
#include <stdlib.h>
#define LINSIZE 256
char **LineBuf;
long Lines = 100;
void MemErr();
void TrimFile();
void
main(ac, av)
char *av[];
{
short i;
for (i = 1; i < ac; ++i) {
if (av[i][0] == '-')
Lines = atol(av[i] + 1);
}
if (Lines < 0) {
fprintf(stderr, "Illegal line specification %d\n", Lines);
exit(1);
}
/*
* Allocating one more than necessary handles the Lines == 0 case
* as well as supplying a scratch buffer for the last fgets that
* fails.
*/
LineBuf = malloc(sizeof(char *) * (Lines + 1));
if (LineBuf == NULL)
MemErr();
for (i = 0; i <= Lines; ++i) {
LineBuf[i] = malloc(LINSIZE);
if (LineBuf[i] == NULL)
MemErr();
}
for (i = 1; i < ac; ++i) {
char *ptr = av[i];
if (*ptr == '-')
continue;
TrimFile(ptr);
}
}
void
MemErr()
{
fprintf(stderr, "Not enough memory!\n");
exit(1);
}
void
TrimFile(name)
char *name;
{
FILE *fi = fopen(name, "r");
long rep;
long i;
if (fi == NULL)
return;
i = 0;
rep = 0;
while (fgets(LineBuf[i], LINSIZE, fi)) {
if (++i > Lines) {
i = 0;
rep = 1;
}
}
fclose(fi);
if (rep == 0)
return;
if (fi = fopen(name, "w")) {
long j;
for (j = Lines; j; --j) {
if (++i > Lines)
i = 0;
fputs(LineBuf[i], fi);
}
fclose(fi);
}
}