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-rw-r--r--toys/pending/tr.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/toys/pending/tr.c b/toys/pending/tr.c
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+/* tr.c - translate or delete characters
+ *
+ * Copyright 2014 Sandeep Sharma <sandeep.jack2756@gmail.com>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/tr.html
+
+USE_TR(NEWTOY(tr, "^>2<1Ccsd[+cC]", TOYFLAG_USR|TOYFLAG_BIN))
+
+config TR
+ bool "tr"
+ default n
+ help
+ usage: tr [-cds] SET1 [SET2]
+
+ Translate, squeeze, or delete characters from stdin, writing to stdout
+
+ -c/-C Take complement of SET1
+ -d Delete input characters coded SET1
+ -s Squeeze multiple output characters of SET2 into one character
+*/
+
+#define FOR_tr
+#include "toys.h"
+
+GLOBALS(
+ short map[256]; //map of chars
+ int len1, len2;
+)
+
+enum {
+ class_alpha, class_alnum, class_digit,
+ class_lower,class_upper,class_space,class_blank,
+ class_punct,class_cntrl,class_xdigit,class_invalid
+};
+
+static void map_translation(char *set1 , char *set2)
+{
+ int i = TT.len1, k = 0;
+
+ if (toys.optflags & FLAG_d)
+ for (; i; i--, k++) TT.map[set1[k]] = set1[k]|0x100; //set delete bit
+
+ if (toys.optflags & FLAG_s) {
+ for (i = TT.len1, k = 0; i; i--, k++)
+ TT.map[set1[k]] = TT.map[set1[k]]|0x200;
+ for (i = TT.len2, k = 0; i; i--, k++)
+ TT.map[set2[k]] = TT.map[set2[k]]|0x200;
+ }
+ i = k = 0;
+ while (!(toys.optflags & FLAG_d) && set2 && TT.len1--) { //ignore set2 if -d present
+ TT.map[set1[i]] = ((TT.map[set1[i]] & 0xFF00) | set2[k]);
+ if (set2[k + 1]) k++;
+ i++;
+ }
+}
+
+static int handle_escape_char(char **esc_val) //taken from printf
+{
+ char *ptr = *esc_val;
+ int esc_length = 0;
+ unsigned base = 0, num = 0, result = 0, count = 0;
+
+ if (*ptr == 'x') {
+ ptr++;
+ esc_length++;
+ base = 16;
+ } else if (isdigit(*ptr)) base = 8;
+
+ while (esc_length < 3 && base) {
+ num = tolower(*ptr) - '0';
+ if (num > 10) num += ('0' - 'a' + 10);
+ if (num >= base) {
+ if (base == 16) {
+ esc_length--;
+ if (!esc_length) {// Invalid hex value eg. /xvd, print as it is /xvd
+ result = '\\';
+ ptr--;
+ }
+ }
+ break;
+ }
+ esc_length++;
+ count = result = (count * base) + num;
+ ptr++;
+ }
+ if (base) {
+ ptr--;
+ *esc_val = ptr;
+ return (char)result;
+ } else {
+ switch (*ptr) {
+ case 'n': result = '\n'; break;
+ case 't': result = '\t'; break;
+ case 'e': result = (char)27; break;
+ case 'b': result = '\b'; break;
+ case 'a': result = '\a'; break;
+ case 'f': result = '\f'; break;
+ case 'v': result = '\v'; break;
+ case 'r': result = '\r'; break;
+ case '\\': result = '\\'; break;
+ default :
+ result = '\\';
+ ptr--; // Let pointer pointing to / we will increment after returning.
+ break;
+ }
+ }
+ *esc_val = ptr;
+ return (char)result;
+}
+
+static int find_class(char *class_name)
+{
+ int i;
+ static char *class[] = {
+ "[:alpha:]","[:alnum:]","[:digit:]",
+ "[:lower:]","[:upper:]","[:space:]",
+ "[:blank:]","[:punct:]","[:cntrl:]",
+ "[:xdigit:]","NULL"
+ };
+
+ for (i = 0; i != class_invalid; i++) {
+ if (!memcmp(class_name, class[i], (class_name[0] == 'x')?10:9)) break;
+ }
+ return i;
+}
+
+static char *expand_set(char *arg, int *len)
+{
+ int i = 0, j, k, size = 256;
+ char *set = xzalloc(size*sizeof(char));
+
+ while (*arg) {
+
+ if (i >= size) {
+ size += 256;
+ set = xrealloc(set, size);
+ }
+ if (*arg == '\\') {
+ arg++;
+ set[i++] = (int)handle_escape_char(&arg);
+ arg++;
+ continue;
+ }
+ if (arg[1] == '-') {
+ if (arg[2] == '\0') goto save;
+ j = arg[0];
+ k = arg[2];
+ if (j > k) perror_exit("reverse colating order");
+ while (j <= k) set[i++] = j++;
+ arg += 3;
+ continue;
+ }
+ if (arg[0] == '[' && arg[1] == ':') {
+
+ if ((j = find_class(arg)) == class_invalid) goto save;
+
+ if ((j == class_alpha) || (j == class_upper) || (j == class_alnum)) {
+ for (k = 'A'; k <= 'Z'; k++) set[i++] = k;
+ }
+ if ((j == class_alpha) || (j == class_lower) || (j == class_alnum)) {
+ for (k = 'a'; k <= 'z'; k++) set[i++] = k;
+ }
+ if ((j == class_alnum) || (j == class_digit) || (j == class_xdigit)) {
+ for (k = '0'; k <= '9'; k++) set[i++] = k;
+ }
+ if (j == class_space || j == class_blank) {
+ set[i++] = '\t';
+ if (j == class_space) {
+ set[i++] = '\n';
+ set[i++] = '\f';
+ set[i++] = '\r';
+ set[i++] = '\v';
+ }
+ set[i++] = ' ';
+ }
+ if (j == class_punct) {
+ for (k = 0; k <= 255; k++)
+ if (ispunct(k)) set[i++] = k;
+ }
+ if (j == class_cntrl) {
+ for (k = 0; k <= 255; k++)
+ if (iscntrl(k)) set[i++] = k;
+ }
+ if (j == class_xdigit) {
+ for (k = 'A'; k <= 'F'; k++) {
+ set[i + 6] = k | 0x20;
+ set[i++] = k;
+ }
+ i += 6;
+ arg += 10;
+ continue;
+ }
+
+ arg += 9; //never here for class_xdigit.
+ continue;
+ }
+ if (arg[0] == '[' && arg[1] == '=') { //[=char=] only
+ arg += 2;
+ if (*arg) set[i++] = *arg;
+ if (!arg[1] || arg[1] != '=' || arg[2] != ']')
+ error_exit("bad equiv class");
+ continue;
+ }
+save:
+ set[i++] = *arg++;
+ }
+ *len = i;
+ return set;
+}
+
+static void print_map(char *set1, char *set2)
+{
+ int r = 0, i, prev_char = -1;
+
+ while (1)
+ {
+ i = 0;
+ r = read(STDIN_FILENO, (toybuf), sizeof(toybuf));
+ if (!r) break;
+ for (;r > i;i++) {
+
+ if ((toys.optflags & FLAG_d) && (TT.map[(int)toybuf[i]] & 0x100)) continue;
+ if (toys.optflags & FLAG_s) {
+ if ((TT.map[(int)toybuf[i]] & 0x200) &&
+ (prev_char == TT.map[(int)toybuf[i]])) {
+ continue;
+ }
+ }
+ xputc(TT.map[(int)toybuf[i]] & 0xFF);
+ prev_char = TT.map[(int)toybuf[i]];
+ fflush(stdout);
+ }
+ }
+}
+
+static void do_complement(char **set)
+{
+ int i, j;
+ char *comp = xmalloc(256);
+
+ for (i = 0, j = 0;i < 256; i++) {
+ if (memchr(*set, i, TT.len1)) continue;
+ else comp[j++] = (char)i;
+ }
+ free(*set);
+ TT.len1 = j;
+ *set = comp;
+}
+
+void tr_main(void)
+{
+ char *set1, *set2 = NULL;
+ int i;
+
+ for (i = 0; i < 256; i++) TT.map[i] = i; //init map
+
+ set1 = expand_set(toys.optargs[0], &TT.len1);
+ if (toys.optflags & FLAG_c) do_complement(&set1);
+ if (toys.optargs[1]) {
+ if (toys.optargs[1][0] == '\0') error_exit("set2 can't be empty string");
+ set2 = expand_set(toys.optargs[1], &TT.len2);
+ }
+ map_translation(set1, set2);
+
+ print_map(set1, set2);
+ free(set1);
+ free(set2);
+}
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