FreeCalypso > hg > freecalypso-tools
annotate miscutil/fc-rgbconv.c @ 465:003e48f8ebe1
rvinterf/etmsync/fsnew.c: cast 0 to (char *) for execl sentinel
I generally don't use NULL and use plain 0 instead, based on a "NULL
considered harmful" discussion on the classiccmp mailing list many aeons
ago (I couldn't find it, and I reason that it must have been 2005 or
earlier), but a recent complaint by a packager sent me searching, and I
found this:
https://ewontfix.com/11/
While I don't give a @#$% about "modern" systems and code-nazi tools,
I realized that passing a plain 0 as a pointer sentinel in execl is wrong
because it will break on systems where pointers are longer than the plain
int type. Again, I don't give a @#$% about the abomination of x86_64 and
the like, but if anyone ever manages to port my code to something like a
PDP-11 (16-bit int, 32-bit long and pointers), then passing a plain 0
as a function argument where a pointer is expected most definitely won't
work: if the most natural stack slot and SP alignment unit is 16 bits,
fitting an int, with longs and pointers taking up two such slots, then
the call stack will be totally wrong with a plain 0 passed for a pointer.
Casting the 0 to (char *) ought to be the most kosher solution for the
most retro systems possible.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 11 Feb 2019 00:00:19 +0000 |
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0
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1 /* |
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2 * This utility is an aid for phone UI development. The color LCDs in the |
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3 * phones targeted by FreeCalypso implement 16-bit color in RGB 5:6:5 format, |
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4 * but these 16-bit color words are not particularly intuitive in raw hex form. |
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5 * In contrast, a 24-bit RGB 8:8:8 color given in RRGGBB hex form is quite |
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6 * intuitive, at least to those who understand RGB. |
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7 * |
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8 * This utility performs the conversion. It takes a single command line |
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9 * argument that must be either 4 or 6 hex digits. If the argument is 4 hex |
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10 * digits, it is interpreted as RGB 5:6:5 and converted into RGB 8:8:8. |
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11 * If the argument is 6 hex digits, it is interpreted as RGB 8:8:8 and |
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12 * converted into RGB 5:6:5. The output of the conversion is emitted on |
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13 * stdout as 4 or 6 hex digits. |
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14 */ |
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15 |
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16 #include <stdio.h> |
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17 #include <stdlib.h> |
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18 #include <ctype.h> |
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19 #include <string.h> |
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20 |
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21 is_arg_all_hex(str) |
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22 char *str; |
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23 { |
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24 char *cp; |
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25 int c; |
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26 |
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27 for (cp = str; c = *cp++; ) |
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28 if (!isxdigit(c)) |
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29 return(0); |
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30 return(1); |
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31 } |
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32 |
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33 convert_565_to_888(in) |
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34 unsigned in; |
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35 { |
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36 unsigned r, g, b; |
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37 |
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38 r = in >> 11; |
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39 g = (in >> 5) & 0x3F; |
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40 b = in & 0x1F; |
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41 printf("%02X%02X%02X\n", r << 3, g << 2, b << 3); |
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42 } |
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43 |
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44 convert_888_to_565(in) |
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45 unsigned in; |
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46 { |
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47 unsigned r, g, b; |
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48 |
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49 r = (in >> 16) >> 3; |
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50 g = ((in >> 8) & 0xFF) >> 2; |
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51 b = (in & 0xFF) >> 3; |
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52 printf("%04X\n", (r << 11) | (g << 5) | b); |
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53 } |
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54 |
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55 main(argc, argv) |
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56 char **argv; |
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57 { |
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58 unsigned in; |
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59 |
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60 if (argc != 2) { |
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61 usage: fprintf(stderr, |
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62 "please specify one 4-digit or 6-digit hex RGB value\n"); |
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63 exit(1); |
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64 } |
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65 if (!is_arg_all_hex(argv[1])) |
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66 goto usage; |
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67 in = strtoul(argv[1], 0, 16); |
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68 switch (strlen(argv[1])) { |
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69 case 4: |
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70 convert_565_to_888(in); |
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71 exit(0); |
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72 case 6: |
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73 convert_888_to_565(in); |
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74 exit(0); |
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75 } |
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76 goto usage; |
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77 } |