1 /* 2 * Copyright (C) 1984-2012 Mark Nudelman 3 * Modified for use with illumos by Garrett D'Amore. 4 * Copyright 2014 Garrett D'Amore <garrett@damore.org> 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 * 9 * For more information, see the README file. 10 */ 11 12 /* 13 * Routines to convert text in various ways. Used by search. 14 */ 15 16 #include "charset.h" 17 #include "less.h" 18 19 extern int utf_mode; 20 21 /* 22 * Get the length of a buffer needed to convert a string. 23 */ 24 int 25 cvt_length(int len) 26 { 27 if (utf_mode) 28 /* 29 * Just copying a string in UTF-8 mode can cause it to grow 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 */ 40 int * 41 cvt_alloc_chpos(int len) 42 { 43 int i; 44 int *chpos = ecalloc(sizeof (int), len); 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 */ 56 void 57 cvt_text(char *odst, char *osrc, int *chpos, int *lenp, int ops) 58 { 59 char *dst; 60 char *edst = odst; 61 char *src; 62 char *src_end; 63 LWCHAR ch; 64 65 if (lenp != NULL) 66 src_end = osrc + *lenp; 67 else 68 src_end = osrc + strlen(osrc); 69 70 for (src = osrc, dst = odst; src < src_end; ) { 71 int src_pos = src - osrc; 72 int dst_pos = dst - odst; 73 ch = step_char(&src, +1, src_end); 74 if ((ops & CVT_BS) && ch == '\b' && dst > odst) { 75 /* Delete backspace and preceding char. */ 76 do { 77 dst--; 78 } while (dst > odst && 79 !IS_ASCII_OCTET(*dst) && !IS_UTF8_LEAD(*dst)); 80 } else if ((ops & CVT_ANSI) && IS_CSI_START(ch)) { 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; 86 } else { 87 /* Just copy the char to the destination buffer. */ 88 if ((ops & CVT_TO_LC) && iswupper(ch)) 89 ch = towlower(ch); 90 put_wchar(&dst, ch); 91 /* Record the original position of the char. */ 92 if (chpos != NULL) 93 chpos[dst_pos] = src_pos; 94 } 95 if (dst > edst) 96 edst = dst; 97 } 98 if ((ops & CVT_CRLF) && edst > odst && edst[-1] == '\r') 99 edst--; 100 *edst = '\0'; 101 if (lenp != NULL) 102 *lenp = edst - odst; 103 } 104