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annotate menu.c @ 868:1bab7e01ae98

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Allow directory navigation in menu. Sort directory entries
author Michael Pavone <pavone@retrodev.com>
date Fri, 06 Nov 2015 14:17:41 -0800
parents 69a6ec208111
children f173317ecdb4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
866
69a6ec208111 Menu ROM now pulls real file names from the OS rather than using a fake list
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1 #include <stdint.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <stdio.h>
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5 #include "blastem.h"
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6 #include "menu.h"
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7 #include "backend.h"
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8 #include "util.h"
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9
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10
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11 uint16_t menu_read_w(uint32_t address, void * context)
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12 {
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13 //This should return the status of the last request with 0
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14 //meaning either the request is complete or no request is pending
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15 //in the current implementation, the operations happen instantly
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16 //in emulated time so we can always return 0
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17 return 0;
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18 }
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19
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20 int menu_dir_sort(const void *a, const void *b)
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21 {
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22 const dir_entry *da, *db;
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23 da = a;
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24 db = b;
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25 if (da->is_dir != db->is_dir) {
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26 return db->is_dir - da->is_dir;
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27 }
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28 return strcasecmp(((dir_entry *)a)->name, ((dir_entry *)b)->name);
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29 }
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30
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31 void * menu_write_w(uint32_t address, void * context, uint16_t value)
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32 {
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33 m68k_context *m68k = context;
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34 genesis_context *gen = m68k->system;
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35 menu_context *menu = gen->extra;
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36 if (!menu) {
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37 gen->extra = menu = calloc(1, sizeof(menu_context));
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38 menu->curpath = strdup(get_home_dir());
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39 }
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40 if (menu->state) {
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41 uint32_t dst = menu->latch << 16 | value;
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42 switch (address >> 2)
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43 {
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44 case 0: {
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45 size_t num_entries;
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46 dir_entry *entries = get_dir_list(menu->curpath, &num_entries);
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47 if (entries) {
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48 qsort(entries, num_entries, sizeof(dir_entry), menu_dir_sort);
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49 }
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50 uint8_t *dest;
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51 for (size_t i = 0; i < num_entries; i++)
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52 {
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53 dest = get_native_pointer(dst, (void **)m68k->mem_pointers, &m68k->options->gen);
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54 if (!dest) {
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55 break;
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56 }
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57 *(dest++) = entries[i].is_dir;
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58 *(dest++) = 1;
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59 dst += 2;
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60 uint8_t term = 0;
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61 for (char *cpos = entries[i].name; *cpos; cpos++)
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62 {
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63 dest[1] = *cpos;
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64 dest[0] = cpos[1];
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65 if (cpos[1]) {
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66 cpos++;
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67 } else {
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68 term = 1;
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69 }
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70 dst += 2;
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71 if (!(dst & 0xFFFF)) {
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72 //we may have walked off the end of a memory block, get a fresh native pointer
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73 dest = get_native_pointer(dst, (void **)m68k->mem_pointers, &m68k->options->gen);
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74 if (!dest) {
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75 break;
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76 }
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77 } else {
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78 dest += 2;
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79 }
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80 }
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81 if (!term) {
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82 *(dest++) = 0;
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83 *dest = 0;
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84 dst += 2;
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85 }
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86 }
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87 //terminate list
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88 dest = get_native_pointer(dst, (void **)m68k->mem_pointers, &m68k->options->gen);
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89 if (dest) {
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90 *dest = dest[1] = 0;
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91 free_dir_list(entries, num_entries);
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92 }
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93 break;
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94 }
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95 case 1: {
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96 char buf[4096];
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97 char *cur;
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98 char * dest = NULL;
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99 for (cur = buf; cur < buf+sizeof(buf); cur+=2, dst+=2, dest+=2)
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100 {
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101 if (!dest || !(dst & 0xFFFF)) {
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102 //we may have walked off the end of a memory block, get a fresh native pointer
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103 dest = get_native_pointer(dst, (void **)m68k->mem_pointers, &m68k->options->gen);
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104 if (!dest) {
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105 break;
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106 }
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107 }
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108 *cur = dest[1];
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109 cur[1] = *dest;
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110 if (!*dest || !dest[1]) {
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111 break;
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112 }
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113 }
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114 char *pieces[] = {menu->curpath, "/", buf};
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115 menu->curpath = alloc_concat_m(3, pieces);
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116 free(pieces[0]);
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117 break;
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118 }
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119 default:
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120 fprintf(stderr, "WARNING: write to undefined menu port %X\n", address);
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121 }
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122 menu->state = 0;
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123 } else {
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124 menu->latch = value;
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125 menu->state = 1;
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126 }
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127
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128 return context;
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129 }