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Small code cleanup in tail(1)

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This commit is contained in:
FRIGN 2015-02-09 18:46:47 +01:00
parent 006c9739b3
commit 9292ae2e16
1 changed files with 21 additions and 19 deletions
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38
tail.c
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@ -13,9 +13,11 @@
#include "util.h"
static int fflag = 0;
static size_t num = 10;
static char mode = 'n';
static void
dropinit(FILE *fp, const char *str, size_t n, char mode)
dropinit(FILE *fp, const char *str)
{
Rune r;
char *buf = NULL;
@ -23,11 +25,11 @@ dropinit(FILE *fp, const char *str, size_t n, char mode)
ssize_t len;
if (mode == 'n') {
while (i < n && (len = getline(&buf, &size, fp)) != -1)
while (i < num && (len = getline(&buf, &size, fp)) != -1)
if (len > 0 && buf[len - 1] == '\n')
i++;
} else {
while (i < n && (len = readrune(str, fp, &r)))
while (i < num && (len = readrune(str, fp, &r)))
i++;
}
free(buf);
@ -35,23 +37,23 @@ dropinit(FILE *fp, const char *str, size_t n, char mode)
}
static void
taketail(FILE *fp, const char *str, size_t n, char mode)
taketail(FILE *fp, const char *str)
{
Rune *r = NULL;
char **ring = NULL;
size_t i, j, *size = NULL;
if (mode == 'n') {
ring = ecalloc(n, sizeof *ring);
size = ecalloc(n, sizeof *size);
ring = ecalloc(num, sizeof *ring);
size = ecalloc(num, sizeof *size);
for (i = j = 0; getline(&ring[i], &size[i], fp) != -1; )
i = j = (i + 1) % n;
i = j = (i + 1) % num;
} else {
r = ecalloc(n, sizeof *r);
r = ecalloc(num, sizeof *r);
for (i = j = 0; readrune(str, fp, &r[i]); )
i = j = (i + 1) % n;
i = j = (i + 1) % num;
}
if (ferror(fp))
eprintf("%s: read error:", str);
@ -60,20 +62,20 @@ taketail(FILE *fp, const char *str, size_t n, char mode)
if (ring && ring[j]) {
fputs(ring[j], stdout);
free(ring[j]);
}
if (r) {
} else if (r) {
writerune("<stdout>", stdout, &r[j]);
}
} while ((j = (j + 1) % n) != i);
} while ((j = (j + 1) % num) != i);
free(ring);
free(size);
free(r);
}
static void
usage(void)
{
eprintf("usage: %s [-f] [-n lines] [file ...]\n", argv0);
eprintf("usage: %s [-f] [-c num | -n num] [file ...]\n", argv0);
}
int
@ -81,10 +83,10 @@ main(int argc, char *argv[])
{
struct stat st1, st2;
FILE *fp;
size_t num = 10, tmpsize;
size_t tmpsize;
int ret = 0, newline, many;
char mode = 'n', *numstr, *tmp;
void (*tail)(FILE *, const char *, size_t, char) = taketail;
char *numstr, *tmp;
void (*tail)(FILE *, const char *) = taketail;
ARGBEGIN {
case 'f':
@ -106,7 +108,7 @@ main(int argc, char *argv[])
} ARGEND;
if (argc == 0)
tail(stdin, "<stdin>", num, mode);
tail(stdin, "<stdin>");
else {
if ((many = argc > 1) && fflag)
usage();
@ -124,7 +126,7 @@ main(int argc, char *argv[])
if (!(S_ISFIFO(st1.st_mode) || S_ISREG(st1.st_mode)))
fflag = 0;
newline = 1;
tail(fp, argv[0], num, mode);
tail(fp, argv[0]);
if (fflag && argc == 1) {
tmp = NULL;