aboutsummaryrefslogtreecommitdiff
path: root/coreutils/tr.c
diff options
context:
space:
mode:
Diffstat (limited to 'coreutils/tr.c')
-rw-r--r--coreutils/tr.c250
1 files changed, 250 insertions, 0 deletions
diff --git a/coreutils/tr.c b/coreutils/tr.c
new file mode 100644
index 0000000..c736c71
--- /dev/null
+++ b/coreutils/tr.c
@@ -0,0 +1,250 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini tr implementation for busybox
+ *
+ ** Copyright (c) 1987,1997, Prentice Hall All rights reserved.
+ *
+ * The name of Prentice Hall may not be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * Copyright (c) Michiel Huisjes
+ *
+ * This version of tr is adapted from Minix tr and was modified
+ * by Erik Andersen <andersen@codepoet.org> to be used in busybox.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+/* http://www.opengroup.org/onlinepubs/009695399/utilities/tr.html
+ * TODO: xdigit, graph, print
+ */
+#include "libbb.h"
+
+#define ASCII 0377
+
+static void map(char *pvector,
+ unsigned char *string1, unsigned int string1_len,
+ unsigned char *string2, unsigned int string2_len)
+{
+ char last = '0';
+ unsigned int i, j;
+
+ for (j = 0, i = 0; i < string1_len; i++) {
+ if (string2_len <= j)
+ pvector[string1[i]] = last;
+ else
+ pvector[string1[i]] = last = string2[j++];
+ }
+}
+
+/* supported constructs:
+ * Ranges, e.g., 0-9 ==> 0123456789
+ * Ranges, e.g., [0-9] ==> 0123456789
+ * Escapes, e.g., \a ==> Control-G
+ * Character classes, e.g. [:upper:] ==> A...Z
+ * Equiv classess, e.g. [=A=] ==> A (hmmmmmmm?)
+ */
+static unsigned int expand(const char *arg, char *buffer)
+{
+ char *buffer_start = buffer;
+ unsigned i; /* can't be unsigned char: must be able to hold 256 */
+ unsigned char ac;
+
+ while (*arg) {
+ if (*arg == '\\') {
+ arg++;
+ *buffer++ = bb_process_escape_sequence(&arg);
+ continue;
+ }
+ if (arg[1] == '-') { /* "0-9..." */
+ ac = arg[2];
+ if (ac == '\0') { /* "0-": copy verbatim */
+ *buffer++ = *arg++; /* copy '0' */
+ continue; /* next iter will copy '-' and stop */
+ }
+ i = *arg;
+ while (i <= ac) /* ok: i is unsigned _int_ */
+ *buffer++ = i++;
+ arg += 3; /* skip 0-9 */
+ continue;
+ }
+ if (*arg == '[') { /* "[xyz..." */
+ arg++;
+ i = *arg++;
+ /* "[xyz...", i=x, arg points to y */
+ if (ENABLE_FEATURE_TR_CLASSES && i == ':') {
+#define CLO ":]\0"
+ static const char classes[] ALIGN1 =
+ "alpha"CLO "alnum"CLO "digit"CLO
+ "lower"CLO "upper"CLO "space"CLO
+ "blank"CLO "punct"CLO "cntrl"CLO;
+#define CLASS_invalid 0 /* we increment the retval */
+#define CLASS_alpha 1
+#define CLASS_alnum 2
+#define CLASS_digit 3
+#define CLASS_lower 4
+#define CLASS_upper 5
+#define CLASS_space 6
+#define CLASS_blank 7
+#define CLASS_punct 8
+#define CLASS_cntrl 9
+//#define CLASS_xdigit 10
+//#define CLASS_graph 11
+//#define CLASS_print 12
+ smalluint j;
+ { /* not really pretty.. */
+ char *tmp = xstrndup(arg, 7); // warning: xdigit would need 8, not 7
+ j = index_in_strings(classes, tmp) + 1;
+ free(tmp);
+ }
+ if (j == CLASS_alnum || j == CLASS_digit) {
+ for (i = '0'; i <= '9'; i++)
+ *buffer++ = i;
+ }
+ if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_upper) {
+ for (i = 'A'; i <= 'Z'; i++)
+ *buffer++ = i;
+ }
+ if (j == CLASS_alpha || j == CLASS_alnum || j == CLASS_lower) {
+ for (i = 'a'; i <= 'z'; i++)
+ *buffer++ = i;
+ }
+ if (j == CLASS_space || j == CLASS_blank) {
+ *buffer++ = '\t';
+ if (j == CLASS_space) {
+ *buffer++ = '\n';
+ *buffer++ = '\v';
+ *buffer++ = '\f';
+ *buffer++ = '\r';
+ }
+ *buffer++ = ' ';
+ }
+ if (j == CLASS_punct || j == CLASS_cntrl) {
+ for (i = '\0'; i <= ASCII; i++)
+ if ((j == CLASS_punct && isprint(i) && !isalnum(i) && !isspace(i))
+ || (j == CLASS_cntrl && iscntrl(i)))
+ *buffer++ = i;
+ }
+ if (j == CLASS_invalid) {
+ *buffer++ = '[';
+ *buffer++ = ':';
+ continue;
+ }
+ break;
+ }
+ /* "[xyz...", i=x, arg points to y */
+ if (ENABLE_FEATURE_TR_EQUIV && i == '=') { /* [=CHAR=] */
+ *buffer++ = *arg; /* copy CHAR */
+ if (!*arg || arg[1] != '=' || arg[2] != ']')
+ bb_show_usage();
+ arg += 3; /* skip CHAR=] */
+ continue;
+ }
+ if (i == '\0' || *arg != '-') { /* not [x-...] - copy verbatim */
+ *buffer++ = '[';
+ arg--; /* points to x */
+ continue; /* copy all, including eventual ']' */
+ }
+ /* [x-z] */
+ arg++; /* skip - */
+ if (arg[0] == '\0' || arg[1] != ']')
+ bb_show_usage();
+ ac = *arg++;
+ while (i <= ac)
+ *buffer++ = i++;
+ arg++; /* skip ] */
+ continue;
+ }
+ *buffer++ = *arg++;
+ }
+ return (buffer - buffer_start);
+}
+
+static int complement(char *buffer, int buffer_len)
+{
+ int i, j, ix;
+ char conv[ASCII + 2];
+
+ ix = 0;
+ for (i = '\0'; i <= ASCII; i++) {
+ for (j = 0; j < buffer_len; j++)
+ if (buffer[j] == i)
+ break;
+ if (j == buffer_len)
+ conv[ix++] = i & ASCII;
+ }
+ memcpy(buffer, conv, ix);
+ return ix;
+}
+
+int tr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int tr_main(int argc UNUSED_PARAM, char **argv)
+{
+ int output_length = 0, input_length;
+ int i;
+ smalluint flags;
+ ssize_t read_chars = 0;
+ size_t in_index = 0, out_index = 0;
+ unsigned last = UCHAR_MAX + 1; /* not equal to any char */
+ unsigned char coded, c;
+ unsigned char *output = xmalloc(BUFSIZ);
+ char *vector = xzalloc((ASCII+1) * 3);
+ char *invec = vector + (ASCII+1);
+ char *outvec = vector + (ASCII+1) * 2;
+
+#define TR_OPT_complement (1 << 0)
+#define TR_OPT_delete (1 << 1)
+#define TR_OPT_squeeze_reps (1 << 2)
+
+ flags = getopt32(argv, "+cds"); /* '+': stop at first non-option */
+ argv += optind;
+
+ for (i = 0; i <= ASCII; i++) {
+ vector[i] = i;
+ /*invec[i] = outvec[i] = FALSE; - done by xzalloc */
+ }
+
+#define tr_buf bb_common_bufsiz1
+ if (*argv != NULL) {
+ input_length = expand(*argv++, tr_buf);
+ if (flags & TR_OPT_complement)
+ input_length = complement(tr_buf, input_length);
+ if (*argv) {
+ if (argv[0][0] == '\0')
+ bb_error_msg_and_die("STRING2 cannot be empty");
+ output_length = expand(*argv, (char *)output);
+ map(vector, (unsigned char *)tr_buf, input_length, output, output_length);
+ }
+ for (i = 0; i < input_length; i++)
+ invec[(unsigned char)tr_buf[i]] = TRUE;
+ for (i = 0; i < output_length; i++)
+ outvec[output[i]] = TRUE;
+ }
+
+ for (;;) {
+ /* If we're out of input, flush output and read more input. */
+ if ((ssize_t)in_index == read_chars) {
+ if (out_index) {
+ xwrite(STDOUT_FILENO, (char *)output, out_index);
+ out_index = 0;
+ }
+ read_chars = safe_read(STDIN_FILENO, tr_buf, BUFSIZ);
+ if (read_chars <= 0) {
+ if (read_chars < 0)
+ bb_perror_msg_and_die(bb_msg_read_error);
+ exit(EXIT_SUCCESS);
+ }
+ in_index = 0;
+ }
+ c = tr_buf[in_index++];
+ coded = vector[c];
+ if ((flags & TR_OPT_delete) && invec[c])
+ continue;
+ if ((flags & TR_OPT_squeeze_reps) && last == coded
+ && (invec[c] || outvec[coded]))
+ continue;
+ output[out_index++] = last = coded;
+ }
+ /* NOTREACHED */
+ return EXIT_SUCCESS;
+}