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authorEric Andersen2000-07-13 16:40:41 +0000
committerEric Andersen2000-07-13 16:40:41 +0000
commit00143ba921f64caab7e55bc4c90006586d4bcc4a (patch)
tree856fdf2d40af7489dfc34050138788e4638081f9 /tr.c
parentac48461da9b04ecf8548f4a0497e3b622a0ae5f1 (diff)
downloadbusybox-00143ba921f64caab7e55bc4c90006586d4bcc4a.zip
busybox-00143ba921f64caab7e55bc4c90006586d4bcc4a.tar.gz
From Matt Kraai <kraai@alumni.carnegiemellon.edu>
> Here is a patch so that tr can handle NULL characters as well. Give it > a shot and let me know what you think. It is against the latest CVS > version. > > In my tests, the following now works as expected. > > tr '\0' '\n' > > Later, > Matt
Diffstat (limited to 'tr.c')
-rw-r--r--tr.c52
1 files changed, 28 insertions, 24 deletions
diff --git a/tr.c b/tr.c
index 293bbce..563ee08 100644
--- a/tr.c
+++ b/tr.c
@@ -98,21 +98,23 @@ static void convert()
/* NOTREACHED */
}
-static void map(register unsigned char *string1, register unsigned char *string2)
+static void map(register unsigned char *string1, unsigned int string1_len,
+ register unsigned char *string2, unsigned int string2_len)
{
unsigned char last = '0';
+ unsigned int i, j;
- while (*string1) {
- if (*string2 == '\0')
- vector[*string1] = last;
+ for (j = 0, i = 0; i < string1_len; i++) {
+ if (string2_len <= j)
+ vector[string1[i]] = last;
else
- vector[*string1] = last = *string2++;
- string1++;
+ vector[string1[i]] = last = string2[j++];
}
}
-static void expand(char *arg, register unsigned char *buffer)
+static unsigned int expand(char *arg, register unsigned char *buffer)
{
+ unsigned char *buffer_start = buffer;
int i, ac;
while (*arg) {
@@ -134,29 +136,31 @@ static void expand(char *arg, register unsigned char *buffer)
} else
*buffer++ = *arg++;
}
+
+ return (buffer - buffer_start);
}
-static void complement(unsigned char *buffer)
+static int complement(unsigned char *buffer, unsigned int buffer_len)
{
- register unsigned char *ptr;
- register short i, index;
+ register short i, j, index;
unsigned char conv[ASCII + 2];
index = 0;
- for (i = 1; i <= ASCII; i++) {
- for (ptr = buffer; *ptr; ptr++)
- if (*ptr == i)
+ for (i = 0; i <= ASCII; i++) {
+ for (j = 0; j < buffer_len; j++)
+ if (buffer[j] == i)
break;
- if (*ptr == '\0')
+ if (j == buffer_len)
conv[index++] = i & ASCII;
}
- conv[index] = '\0';
- strcpy((char *) buffer, (char *) conv);
+ memcpy(buffer, conv, index);
+ return index;
}
extern int tr_main(int argc, char **argv)
{
register unsigned char *ptr;
+ unsigned int output_length, input_length;
int index = 1;
short i;
@@ -184,19 +188,19 @@ extern int tr_main(int argc, char **argv)
}
if (argv[index] != NULL) {
- expand(argv[index++], input);
+ input_length = expand(argv[index++], input);
if (com_fl)
- complement(input);
+ input_length = complement(input, input_length);
if (argv[index] != NULL) {
if (*argv[index] == '\0')
fatalError("STRING2 cannot be empty\n");
- expand(argv[index], output);
- map(input, output);
+ output_length = expand(argv[index], output);
+ map(input, input_length, output, output_length);
}
- for (ptr = input; *ptr; ptr++)
- invec[*ptr] = TRUE;
- for (ptr = output; *ptr; ptr++)
- outvec[*ptr] = TRUE;
+ for (i = 0; i < input_length; i++)
+ invec[input[i]] = TRUE;
+ for (i = 0; i < output_length; i++)
+ outvec[output[i]] = TRUE;
}
convert();
return (0);