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Annotation of src/usr.bin/less/cvt.c, Revision 1.6

1.1       shadchin    1: /*
1.3       shadchin    2:  * Copyright (C) 1984-2012  Mark Nudelman
1.5       nicm        3:  * Modified for use with illumos by Garrett D'Amore.
                      4:  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
1.1       shadchin    5:  *
                      6:  * You may distribute under the terms of either the GNU General Public
                      7:  * License or the Less License, as specified in the README file.
                      8:  *
1.3       shadchin    9:  * For more information, see the README file.
1.4       nicm       10:  */
1.1       shadchin   11:
                     12: /*
                     13:  * Routines to convert text in various ways.  Used by search.
                     14:  */
                     15:
                     16: #include "less.h"
                     17: #include "charset.h"
                     18:
                     19: extern int utf_mode;
                     20:
                     21: /*
                     22:  * Get the length of a buffer needed to convert a string.
                     23:  */
1.4       nicm       24: int
                     25: cvt_length(int len)
1.1       shadchin   26: {
                     27:        if (utf_mode)
                     28:                /*
1.4       nicm       29:                 * Just copying a string in UTF-8 mode can cause it to grow
1.1       shadchin   30:                 * in length.
                     31:                 * Four output bytes for one input byte is the worst case.
                     32:                 */
                     33:                len *= 4;
                     34:        return (len + 1);
                     35: }
                     36:
                     37: /*
                     38:  * Allocate a chpos array for use by cvt_text.
                     39:  */
1.4       nicm       40: int *
                     41: cvt_alloc_chpos(int len)
1.1       shadchin   42: {
                     43:        int i;
1.4       nicm       44:        int *chpos = ecalloc(sizeof (int), len);
1.1       shadchin   45:        /* Initialize all entries to an invalid position. */
                     46:        for (i = 0;  i < len;  i++)
                     47:                chpos[i] = -1;
                     48:        return (chpos);
                     49: }
                     50:
                     51: /*
                     52:  * Convert text.  Perform the transformations specified by ops.
                     53:  * Returns converted text in odst.  The original offset of each
                     54:  * odst character (when it was in osrc) is returned in the chpos array.
                     55:  */
1.4       nicm       56: void
                     57: cvt_text(char *odst, char *osrc, int *chpos, int *lenp, int ops)
1.1       shadchin   58: {
                     59:        char *dst;
1.3       shadchin   60:        char *edst = odst;
1.1       shadchin   61:        char *src;
1.4       nicm       62:        char *src_end;
1.1       shadchin   63:        LWCHAR ch;
                     64:
                     65:        if (lenp != NULL)
                     66:                src_end = osrc + *lenp;
                     67:        else
                     68:                src_end = osrc + strlen(osrc);
                     69:
1.4       nicm       70:        for (src = osrc, dst = odst;  src < src_end; ) {
1.1       shadchin   71:                int src_pos = src - osrc;
                     72:                int dst_pos = dst - odst;
                     73:                ch = step_char(&src, +1, src_end);
1.4       nicm       74:                if ((ops & CVT_BS) && ch == '\b' && dst > odst) {
1.1       shadchin   75:                        /* Delete backspace and preceding char. */
                     76:                        do {
                     77:                                dst--;
                     78:                        } while (dst > odst &&
1.4       nicm       79:                            !IS_ASCII_OCTET(*dst) && !IS_UTF8_LEAD(*dst));
                     80:                } else if ((ops & CVT_ANSI) && IS_CSI_START(ch)) {
1.1       shadchin   81:                        /* Skip to end of ANSI escape sequence. */
                     82:                        src++;  /* skip the CSI start char */
                     83:                        while (src < src_end)
                     84:                                if (!is_ansi_middle(*src++))
                     85:                                        break;
1.4       nicm       86:                } else {
1.1       shadchin   87:                        /* Just copy the char to the destination buffer. */
1.6     ! mmcc       88:                        if ((ops & CVT_TO_LC) && iswupper(ch))
        !            89:                                ch = towlower(ch);
1.1       shadchin   90:                        put_wchar(&dst, ch);
1.3       shadchin   91:                        /* Record the original position of the char. */
                     92:                        if (chpos != NULL)
1.1       shadchin   93:                                chpos[dst_pos] = src_pos;
                     94:                }
1.3       shadchin   95:                if (dst > edst)
                     96:                        edst = dst;
1.1       shadchin   97:        }
1.3       shadchin   98:        if ((ops & CVT_CRLF) && edst > odst && edst[-1] == '\r')
                     99:                edst--;
                    100:        *edst = '\0';
1.1       shadchin  101:        if (lenp != NULL)
1.3       shadchin  102:                *lenp = edst - odst;
1.1       shadchin  103: }