added library to deal with text (libtext) - iomenu - interactive terminal-based selection menu
HTML git clone git://bitreich.org/iomenu git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/iomenu
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---
DIR commit 61b9b7eeca080291752b9813705c17208e83505a
DIR parent 5fa48204850bed279e339eb370d2d595e297c274
HTML Author: Josuah Demangeonā ā µ <mail@josuah.net>
Date: Sun, 2 Apr 2017 01:29:06 +0200
added library to deal with text (libtext)
Diffstat:
A text.c | 255 +++++++++++++++++++++++++++++++
A text.h | 6 ++++++
2 files changed, 261 insertions(+), 0 deletions(-)
---
DIR diff --git a/text.c b/text.c
@@ -0,0 +1,255 @@
+/*
+ * Functions handling UTF-8 srings:
+ *
+ * stdin -> buffer -> stdout
+ * char[] -> long[] -> char[]
+ * UTF-8 -> rune -> UTF-8
+ */
+
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "text.h"
+
+
+/*
+ * Return the number of bytes in rune for the `len` next char in `s`,
+ * or 0 if `utf` is misencoded.
+ *
+ * Thanks to Connor Lane Smith for some ideas.
+ */
+int
+utflen(char *s, int n) {
+ int len = 1;
+ int contiunation_bytes =
+ (s[0] & 0x80) == 0x00 ? 0 : /* 0xxxxxxx */
+ (s[0] & 0xc0) == 0x80 ? 1 : /* 10xxxxxx */
+ (s[0] & 0xe0) == 0xc0 ? 2 : /* 110xxxxx */
+ (s[0] & 0xf0) == 0xe0 ? 3 : /* 1110xxxx */
+ (s[0] & 0xf8) == 0xf0 ? 4 : /* 11110xxx */
+ (s[0] & 0xfc) == 0xf8 ? 5 : /* 111110xx */
+ (s[0] & 0xfe) == 0xfc ? 6 : /* 1111110x */
+ (s[0] & 0xff) == 0xfe ? 7 : /* 11111110 */
+ 8; /* 11111111 */
+
+ if (contiunation_bytes > 6 || contiunation_bytes > n)
+ return 0;
+
+ /* check if continuation bytes are 10xxxxxx and increment `len` */
+ switch (contiunation_bytes) { /* FALLTHROUGH */
+ case 6: if ((s[5] & 0xc0) != 0x80) return 0; else len++;
+ case 5: if ((s[4] & 0xc0) != 0x80) return 0; else len++;
+ case 4: if ((s[3] & 0xc0) != 0x80) return 0; else len++;
+ case 3: if ((s[2] & 0xc0) != 0x80) return 0; else len++;
+ case 2: if ((s[1] & 0xc0) != 0x80) return 0; else len++;
+ case 0: return len;
+ default: return 0;
+ }
+}
+
+
+/*
+ * return the number of bytes required to display `rune`
+ */
+int
+runelen(long r) {
+ if (r <= 0x0000007f) return 1;
+ if (r <= 0x000007ff) return 2;
+ if (r <= 0x0000ffff) return 3;
+ if (r <= 0x001fffff) return 4;
+ if (r <= 0x03ffffff) return 5;
+ if (r <= 0x7fffffff) return 6;
+ return 0;
+}
+
+
+/*
+ * return the firsts `len` bytes in the sring poined by `utf` to a rune.
+ * if the `utf` is misencoded, the first char is returned as a
+ * negative value.
+ */
+int
+utftorune(long *r, char *s, int n) {
+ int len = utflen(s, n);
+
+ /* first byte */
+ switch (len) {
+ case 1: *r = s[0]; return 1; /* 0xxxxxxx */
+ case 2: *r = s[0] & 0x1f; break; /* 110xxxxx */
+ case 3: *r = s[0] & 0x0f; break; /* 1110xxxx */
+ case 4: *r = s[0] & 0x07; break; /* 11110xxx */
+ case 5: *r = s[0] & 0x03; break; /* 111110xx */
+ case 6: *r = s[0] & 0x01; break; /* 1111110x */
+ default: *r = -(unsigned char) s[0]; return 1; /* misencoded */
+ }
+
+ /* continuation bytes */
+ for (int i = 1; i < len; i++)
+ *r = (*r << 6) | (s[i] & 0x3f); /* 10xxxxxx */
+
+ /* overlong sequences */
+ if (runelen(*r) != len) {
+ *r = -(unsigned char) s[0];
+ return 1;
+ }
+
+ return len;
+}
+
+
+/*
+ * return the next rune in the `len` next `utf`, or 0 if
+ * `utf` is misencoded.
+ */
+int
+runetoutf(char *s, long r) {
+ switch (runelen(r)) {
+ case 1:
+ s[0] = r; /* 0xxxxxxx */
+ s[1] = '\0';
+ return 1;
+ case 2:
+ s[0] = 0xc0 | (0x3f & (r >> 6)); /* 110xxxxx */
+ s[1] = 0x80 | (0x3f & (r)); /* 10xxxxxx */
+ s[2] = '\0';
+ return 2;
+ case 3:
+ s[0] = 0xe0 | (0x3f & (r >> 12)); /* 1110xxxx */
+ s[1] = 0x80 | (0x3f & (r >> 6)); /* 10xxxxxx */
+ s[2] = 0x80 | (0x3f & (r)); /* 10xxxxxx */
+ s[3] = '\0';
+ return 3;
+ case 4:
+ s[0] = 0xf0 | (0x3f & (r >> 6)); /* 11110xxx */
+ s[1] = 0x80 | (0x3f & (r >> 6)); /* 10xxxxxx */
+ s[2] = 0x80 | (0x3f & (r >> 6)); /* 10xxxxxx */
+ s[3] = 0x80 | (0x3f & (r)); /* 10xxxxxx */
+ s[4] = '\0';
+ return 4;
+ case 5:
+ s[0] = 0xf8 | (0x3f & (r >> 24)); /* 111110xx */
+ s[1] = 0x80 | (0x3f & (r >> 18)); /* 10xxxxxx */
+ s[2] = 0x80 | (0x3f & (r >> 12)); /* 10xxxxxx */
+ s[3] = 0x80 | (0x3f & (r >> 6)); /* 10xxxxxx */
+ s[4] = 0x80 | (0x3f & (r)); /* 10xxxxxx */
+ s[5] = '\0';
+ return 5;
+ case 6:
+ s[0] = 0xfc | (0x3f & (r >> 30)); /* 1111110x */
+ s[1] = 0x80 | (0x3f & (r >> 24)); /* 10xxxxxx */
+ s[2] = 0x80 | (0x3f & (r >> 18)); /* 10xxxxxx */
+ s[3] = 0x80 | (0x3f & (r >> 12)); /* 10xxxxxx */
+ s[4] = 0x80 | (0x3f & (r >> 6)); /* 10xxxxxx */
+ s[5] = 0x80 | (0x3f & (r)); /* 10xxxxxx */
+ s[6] = '\0';
+ return 6;
+ }
+
+ return 0;
+}
+
+
+/*
+ * Fill `s` with a printable representation of `r` and return the
+ * width of the character
+ */
+int
+runetoprint(char *s, long r, int col)
+{
+ /* ASCII control characters and invalid characters */
+ if (r == '\t') {
+ int i;
+ for (i = 0; i < (col + 1) % 8 - 1; i++)
+ s[i] = ' ';
+ s[i] = '\0';
+
+ } else if (r < ' ' || r == 0x7f) {
+ sprintf(s, "[%02x]", (char) r);
+
+ /* non-breaking space */
+ } else if (r == 0xa0) {
+ sprintf(s, "[ ]");
+
+ /* soft hyphen */
+ } else if (r == 0xad) {
+ sprintf(s, "[-]");
+
+ /* valid UTF-8 but not printable Unicode code points */
+ } else if (
+ /* unicode control */
+ (0x80 <= r && r < 0xa0) ||
+
+ /* outside range */
+ (r > 0x10ffff) ||
+
+ /* noncharacters */
+ (r % 0x010000 == 0x00fffe) ||
+ (r % 0x010000 == 0x00ffff) ||
+ (0x00fdd0 <= r && r <= 0x00fdef) ||
+
+ /* private use */
+ (0x00e000 <= r && r <= 0x00f8ff) ||
+ (0x0f0000 <= r && r <= 0x0ffffd) ||
+ (0x100000 <= r && r <= 0x10fffd) ||
+
+ /* surrogates */
+ (0x00d800 <= r && r <= 0x00dfff)
+ ) {
+ sprintf(s, "[%04x]", (unsigned int) r);
+
+ /* valid unicode characters */
+ } else {
+ runetoutf(s, r);
+ return 1;
+ }
+
+ return 0;
+}
+
+
+/*
+ * Read a newly allocated string `s` from `file` up to the first '\n'
+ * character or the end of the file.
+ */
+int
+getutf(char **s, FILE *file)
+{
+ int i; int c;
+
+ *s = malloc(BUFSIZ);
+
+ for (i = 0; (c = fgetc(file)) != EOF && (c != '\n'); i++) {
+ (*s)[i] = c;
+
+ if ((size_t) i + 16 >= sizeof(s))
+ *s = realloc(*s, sizeof(s) + BUFSIZ);
+ }
+
+ return i;
+}
+
+
+int
+main()
+{
+ char s[7];
+ long r;
+
+ for (int i = 0; i < 9000; i++) {
+ runetoutf(s, i);
+ utftorune(&r, s, 7);
+ runetoutf(s, r);
+ utftorune(&r, s, 7);
+ runetoprint(s, r, 0);
+
+ printf("%5X: ", r);
+ printf("'%s'\t", s);
+
+ if (i % 8 == 0)
+ puts("");
+ }
+
+ return 0;
+}
DIR diff --git a/text.h b/text.h
@@ -0,0 +1,6 @@
+typedef int Rune;
+
+int utflen(char *, int);
+int runelen(Rune);
+int utftorune(Rune *, char *, int);
+int runetoutf(char *, Rune);