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annotate toys/pending/fold.c @ 1240:0d295a46f853 draft

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Here is a basic implementation of fold[0]. It does not support multibyte characters, though that would probably just require more switch cases.
author Samuel Holland <samuel@sholland.net>
date Thu, 03 Apr 2014 18:01:44 -0500
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children 8556669d3928
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1240
0d295a46f853 Here is a basic implementation of fold[0]. It does not support multibyte characters, though that would probably just require more switch cases.
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1 /* fold.c - fold text
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2 *
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3 * Copyright 2014 Samuel Holland <samuel@sholland.net>
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4 *
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5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/fold.html
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6
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7 USE_FOLD(NEWTOY(fold, "bsw#", TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config FOLD
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10 bool "fold"
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11 default n
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12 help
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13 usage: fold [-bs] [-w WIDTH] [FILE...]
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14
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15 Folds/wraps FILE or stdin at 80 columns.
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16
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17 -b Wrap based on bytes instead of columns
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18 -s Wrap at farthest right whitespace
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19 -w Wrap at WIDTH columns instead of 80
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20 */
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21
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22 #define FOR_fold
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23 #include "toys.h"
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24
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25 GLOBALS(
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26 int w_number;
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27 )
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28
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29 void do_fold(int fd, char *name)
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30 {
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31 int buflen, i, len = 0, split;
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32 int max = (toys.optflags & FLAG_w) ? TT.w_number : 80;
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33 char tmp, *buf;
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34
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35 if (max > sizeof(toybuf)) {
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36 error_exit("width (%ld) too big", max);
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37 }
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38
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39 while (read(fd, toybuf, sizeof(toybuf))) {
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40 split = -1;
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41 buf = toybuf;
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42 buflen = strlen(buf);
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43
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44 for (i = 0; i < buflen; i++) {
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45 switch (buf[i]) {
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46 case '\n':
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47 //reset len, FLAG_b or not; just print multiple lines at once
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48 len = 0;
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49 continue;
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50 case '\b':
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51 //len cannot be negative; not allowed to wrap after backspace
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52 if (toys.optflags & FLAG_b) len++;
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53 else if (len > 0) len--;
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54 continue;
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55 case '\r':
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56 //not allowed to wrap after carriage return
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57 if (toys.optflags & FLAG_b) len++;
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58 else len = 0;
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59 continue;
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60 case '\t':
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61 //round to 8, but we add one after falling through
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62 //(because of whitespace, but it also takes care of FLAG_b)
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63 if (!(toys.optflags & FLAG_b)) len = (len & -8) + 7;
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64 case ' ':
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65 split = i;
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66 default:
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67 len++;
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68 }
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69
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70 //we don't want to double up \n; not allowed to wrap before \b
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71 if (len >= max && buf[i+1] != '\n' && buf[i+1] != '\b') {
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72 if (!(toys.optflags & FLAG_s)) split = i; //we split right here
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73 tmp = buf[split+1];
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74 buf[split+1] = 0;
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75 xprintf("%s\n", buf);
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76 buf[split+1] = tmp;
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77 len = 0;
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78 if (split < buflen - 1) {
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79 buf += split + 1;
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80 i = 0;
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81 buflen = strlen(buf);
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82 }
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83 }
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84 }
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85
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86 xputs(buf);
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87 }
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88 }
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89
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90 void fold_main(void)
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91 {
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92 loopfiles(toys.optargs, do_fold);
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93 }