rev |
line source |
jbe@79
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1
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jbe@79
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2 #include <stdlib.h>
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jbe@79
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3 #include <unistd.h>
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jbe@79
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4 #include <stdint.h>
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jbe@79
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5 #include <errno.h>
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jbe@79
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6 #include <string.h>
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jbe@79
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7 #include <stdio.h>
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jbe@79
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8 #include <time.h>
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jbe@79
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9 #include <sys/time.h>
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jbe@79
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10 #include <sys/socket.h>
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jbe@79
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11 #include <sys/select.h>
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jbe@81
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12 #include <fcntl.h>
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13
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jbe@79
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14 #include <lua.h>
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jbe@79
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15 #include <lauxlib.h>
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jbe@79
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16 #include <lualib.h>
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17
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jbe@80
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18 #define MOONBR_IO_MAXSTRERRORLEN 80
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jbe@80
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19 #define MOONBR_IO_WRITEBUFLEN 4096
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20
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jbe@80
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21 #define moonbr_io_errmsg() \
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22 char errmsg[MOONBR_IO_MAXSTRERRORLEN]; \
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23 strerror_r(errno, errmsg, MOONBR_IO_MAXSTRERRORLEN)
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24
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25
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jbe@79
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26 #define MOONBR_IO_HANDLE_MT_REGKEY "moonbridge_io_handle"
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jbe@79
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27 #define MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY "moonbridge_io_handle_public"
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28
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jbe@79
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29 typedef struct {
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jbe@79
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30 int fd;
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jbe@81
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31 int nonblocking;
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jbe@81
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32 int writeerr;
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jbe@81
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33 int writeleft;
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jbe@81
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34 int writeqoff;
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jbe@81
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35 int writebufcnt;
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jbe@80
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36 char writebuf[MOONBR_IO_WRITEBUFLEN];
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jbe@79
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37 } moonbr_io_handle_t;
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jbe@79
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38
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jbe@81
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39 static void moonbr_io_handle_set_nonblocking(lua_State *L, moonbr_io_handle_t *handle, int nonblocking) {
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jbe@81
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40 if (handle->nonblocking != nonblocking) {
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jbe@81
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41 int flags;
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jbe@81
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42 flags = fcntl(handle->fd, F_GETFL, 0);
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jbe@81
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43 if (flags == -1) {
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jbe@81
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44 moonbr_io_errmsg();
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jbe@81
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45 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
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jbe@81
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46 }
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jbe@81
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47 if (nonblocking) flags |= O_NONBLOCK;
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jbe@81
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48 else flags &= ~O_NONBLOCK;
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jbe@81
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49 if (fcntl(handle->fd, F_SETFL, flags) == -1) {
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jbe@81
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50 moonbr_io_errmsg();
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jbe@81
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51 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
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jbe@81
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52 }
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jbe@81
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53 }
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jbe@81
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54 }
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jbe@81
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55
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jbe@80
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56 static int moonbr_io_close(lua_State *L) {
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jbe@80
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57 moonbr_io_handle_t *handle;
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jbe@80
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58 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
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jbe@80
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59 if (handle->fd < 0) luaL_error(L, "Attempt to close a closed I/O handle");
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jbe@80
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60 if (close(handle->fd)) {
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61 handle->fd = -1;
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jbe@80
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62 moonbr_io_errmsg();
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jbe@80
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63 lua_pushnil(L);
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jbe@80
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64 lua_pushstring(L, errmsg);
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jbe@80
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65 return 2;
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jbe@80
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66 }
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jbe@80
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67 handle->fd = -1;
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jbe@80
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68 lua_pushboolean(L, 1);
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jbe@80
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69 return 1;
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jbe@80
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70 }
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jbe@80
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71
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jbe@81
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72 static int moonbr_io_write_impl(lua_State *L, int nonblocking, int flush) {
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73 moonbr_io_handle_t *handle;
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74 int i, top;
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jbe@81
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75 lua_Integer qlen, qpos, qpos2;
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76 const char *str;
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77 size_t strlen, strpos;
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jbe@80
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78 size_t written;
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jbe@80
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79 ssize_t result;
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jbe@80
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80 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
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jbe@81
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81 if (handle->writeerr) {
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jbe@80
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82 lua_pushnil(L);
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jbe@80
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83 lua_pushliteral(L, "Previous write error");
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jbe@80
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84 return 2;
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jbe@80
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85 }
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jbe@81
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86 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);
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jbe@81
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87 if (!flush) top = lua_gettop(L);
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jbe@81
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88 lua_getuservalue(L, 1);
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jbe@81
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89 lua_getfield(L, -1, "writebuf");
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jbe@81
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90 qlen = lua_rawlen(L, -1);
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jbe@81
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91 if (!flush) {
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jbe@81
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92 for (i=2; i<=top; i++) {
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93 luaL_checklstring(L, i, &strlen);
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jbe@81
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94 lua_pushvalue(L, i);
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95 lua_rawseti(L, -2, ++qlen);
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96 handle->writeleft += strlen;
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97 }
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jbe@81
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98 }
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jbe@81
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99 for (qpos=1; qpos<=qlen; qpos++) {
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100 lua_rawgeti(L, -1, qpos);
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101 str = lua_tolstring(L, -1, &strlen);
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102 strpos = handle->writeqoff;
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jbe@81
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103 while (strpos < strlen) {
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104 if (strlen - strpos < MOONBR_IO_WRITEBUFLEN - handle->writebufcnt) {
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jbe@81
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105 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, strlen - strpos);
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jbe@81
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106 handle->writebufcnt += strlen - strpos;
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jbe@80
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107 break;
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jbe@80
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108 } else {
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jbe@80
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109 written = 0;
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jbe@81
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110 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, MOONBR_IO_WRITEBUFLEN - handle->writebufcnt);
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111 strpos += MOONBR_IO_WRITEBUFLEN - handle->writebufcnt;
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jbe@80
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112 while (written < MOONBR_IO_WRITEBUFLEN) {
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113 result = write(handle->fd, handle->writebuf + written, MOONBR_IO_WRITEBUFLEN - written);
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jbe@80
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114 if (result < 0) {
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jbe@81
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115 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
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jbe@81
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116 if (written) {
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117 handle->writebufcnt -= written;
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jbe@81
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118 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
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jbe@81
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119 }
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jbe@81
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120 if (i > 1) {
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jbe@81
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121 for (qpos2=1; qpos2<=qlen; qpos2++) {
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122 if (qpos2+qpos-1 <= qlen) lua_rawgeti(L, -1, qpos2+qpos-1);
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123 else lua_pushnil(L);
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124 lua_rawseti(L, -2, qpos2);
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125 }
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jbe@81
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126 }
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jbe@81
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127 handle->writeqoff = strpos;
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jbe@81
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128 goto moonbr_io_write_impl_block;
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jbe@81
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129 } else if (errno != EINTR) {
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jbe@80
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130 moonbr_io_errmsg();
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131 handle->writeerr = 1;
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jbe@80
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132 lua_pushnil(L);
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jbe@80
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133 lua_pushstring(L, errmsg);
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jbe@80
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134 return 2;
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jbe@80
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135 }
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jbe@80
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136 } else {
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jbe@80
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137 written += result;
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jbe@81
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138 handle->writeleft -= result;
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jbe@80
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139 }
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jbe@80
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140 }
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jbe@81
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141 handle->writebufcnt = 0;
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jbe@80
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142 }
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jbe@80
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143 }
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jbe@81
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144 handle->writeqoff = 0;
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jbe@81
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145 lua_pop(L, 1);
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jbe@81
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146 lua_pushnil(L);
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jbe@81
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147 lua_rawseti(L, -2, qpos);
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jbe@80
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148 }
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jbe@81
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149 if (flush) {
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jbe@81
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150 written = 0;
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jbe@81
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151 while (written < handle->writebufcnt) {
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jbe@81
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152 result = write(handle->fd, handle->writebuf + written, handle->writebufcnt - written);
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jbe@81
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153 if (result < 0) {
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jbe@81
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154 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
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jbe@81
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155 if (written) {
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jbe@81
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156 handle->writebufcnt -= written;
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jbe@81
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157 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
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jbe@81
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158 }
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jbe@81
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159 goto moonbr_io_write_impl_block;
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jbe@81
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160 } else if (errno != EINTR) {
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jbe@81
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161 moonbr_io_errmsg();
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jbe@81
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162 handle->writeerr = -1;
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jbe@81
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163 lua_pushnil(L);
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jbe@81
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164 lua_pushstring(L, errmsg);
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jbe@81
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165 return 2;
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jbe@81
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166 }
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jbe@81
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167 } else {
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jbe@81
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168 written += result;
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jbe@81
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169 handle->writeleft -= result;
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jbe@81
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170 }
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jbe@81
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171 }
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jbe@81
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172 handle->writebufcnt = 0;
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jbe@81
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173 lua_pushinteger(L, 0);
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jbe@81
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174 } else {
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jbe@81
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175 lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
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jbe@81
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176 }
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jbe@80
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177 return 1;
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jbe@81
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178 moonbr_io_write_impl_block:
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jbe@81
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179 if (flush) lua_pushinteger(L, handle->writeleft);
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jbe@81
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180 else lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
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jbe@81
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181 return 1;
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jbe@81
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182 }
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jbe@81
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183
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jbe@81
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184 static int moonbr_io_write(lua_State *L) {
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jbe@81
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185 return moonbr_io_write_impl(L, 0, 0);
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jbe@81
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186 }
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jbe@81
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187
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jbe@81
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188 static int moonbr_io_write_nb(lua_State *L) {
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jbe@81
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189 return moonbr_io_write_impl(L, 1, 0);
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jbe@80
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190 }
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jbe@80
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191
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jbe@80
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192 static int moonbr_io_flush(lua_State *L) {
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jbe@81
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193 return moonbr_io_write_impl(L, 0, 1);
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jbe@81
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194 }
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jbe@81
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195
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jbe@81
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196 static int moonbr_io_flush_nb(lua_State *L) {
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jbe@81
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197 return moonbr_io_write_impl(L, 1, 1);
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jbe@80
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198 }
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jbe@80
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199
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jbe@80
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200 void moonbr_io_pushhandle(lua_State *L, int fd, int gc_idx) {
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jbe@79
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201 moonbr_io_handle_t *handle;
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jbe@79
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202 handle = lua_newuserdata(L, sizeof(moonbr_io_handle_t));
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jbe@79
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203 handle->fd = fd;
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jbe@81
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204 handle->nonblocking = -1;
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jbe@81
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205 handle->writeerr = 0;
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jbe@81
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206 handle->writeleft = 0;
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jbe@81
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207 handle->writeqoff = 0;
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jbe@81
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208 handle->writebufcnt = 0;
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jbe@79
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209 luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);
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jbe@79
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210 lua_setmetatable(L, -2);
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jbe@79
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211 lua_newtable(L); // uservalue
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jbe@81
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212 lua_newtable(L);
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jbe@81
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213 lua_setfield(L, -2, "writebuf");
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jbe@80
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214 if (gc_idx) lua_pushvalue(L, gc_idx);
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jbe@80
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215 else lua_pushcfunction(L, moonbr_io_close);
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jbe@80
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216 lua_setfield(L, -2, "gc");
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jbe@79
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217 lua_newtable(L); // public
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jbe@79
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218 luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
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jbe@79
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219 lua_setmetatable(L, -2);
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jbe@79
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220 lua_setfield(L, -2, "public");
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jbe@79
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221 lua_setuservalue(L, -2);
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jbe@79
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222 }
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jbe@79
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223
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jbe@79
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224 static int moonbr_io_handleindex(lua_State *L) {
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jbe@80
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225 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
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jbe@79
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226 lua_getuservalue(L, 1);
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jbe@79
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227 lua_getfield(L, -1, "public");
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jbe@79
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228 lua_pushvalue(L, 2);
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jbe@79
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229 lua_gettable(L, -2);
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jbe@79
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230 return 1;
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jbe@79
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231 }
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jbe@79
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232
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jbe@79
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233 static int moonbr_io_handlenewindex(lua_State *L) {
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jbe@80
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234 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
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jbe@79
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235 lua_getuservalue(L, 1);
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jbe@79
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236 lua_getfield(L, -1, "public");
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jbe@79
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237 lua_pushvalue(L, 2);
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jbe@79
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238 lua_pushvalue(L, 3);
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jbe@79
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239 lua_settable(L, -3);
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jbe@79
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240 return 0;
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jbe@79
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241 }
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jbe@79
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242
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jbe@80
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243 static int moonbr_io_handlegc(lua_State *L) {
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jbe@80
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244 moonbr_io_handle_t *handle;
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jbe@80
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245 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
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jbe@80
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246 if (handle->fd >= 0) {
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jbe@80
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247 lua_getuservalue(L, 1);
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jbe@80
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248 lua_getfield(L, -1, "gc");
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jbe@80
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249 lua_pushvalue(L, 1);
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jbe@80
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250 lua_call(L, 1, 0);
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jbe@80
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251 }
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jbe@80
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252 return 0;
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jbe@80
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253 }
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jbe@80
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254
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jbe@79
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255 static int moonbr_io_getdummy(lua_State *L) {
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jbe@80
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256 moonbr_io_pushhandle(L, 2, 0);
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jbe@79
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257 return 1;
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jbe@79
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258 }
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jbe@79
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259
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jbe@79
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260 static const struct luaL_Reg moonbr_io_handle_methods[] = {
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jbe@80
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261 {"close", moonbr_io_close},
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jbe@80
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262 {"write", moonbr_io_write},
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jbe@81
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263 {"write_nb", moonbr_io_write_nb},
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jbe@80
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264 {"flush", moonbr_io_flush},
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jbe@81
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265 {"flush_nb", moonbr_io_flush_nb},
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jbe@79
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266 {NULL, NULL}
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jbe@79
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267 };
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jbe@79
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268
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jbe@79
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269 static const struct luaL_Reg moonbr_io_handle_metamethods[] = {
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jbe@79
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270 {"__index", moonbr_io_handleindex},
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jbe@79
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271 {"__newindex", moonbr_io_handlenewindex},
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jbe@80
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272 {"__gc", moonbr_io_handlegc},
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jbe@79
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273 {NULL, NULL}
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jbe@79
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274 };
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jbe@79
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275
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jbe@79
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276 static const struct luaL_Reg moonbr_io_module_funcs[] = {
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jbe@79
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277 {"getdummy", moonbr_io_getdummy},
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jbe@79
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278 {NULL, NULL}
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jbe@79
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279 };
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jbe@79
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280
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jbe@79
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281 int luaopen_moonbridge_io(lua_State *L) {
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jbe@79
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282
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jbe@80
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283 lua_newtable(L); // module
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jbe@80
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284
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jbe@79
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285 lua_newtable(L); // public metatable
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jbe@79
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286 lua_newtable(L); // handle methods
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jbe@79
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287 luaL_setfuncs(L, moonbr_io_handle_methods, 0);
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jbe@80
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288 lua_pushvalue(L, -1);
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jbe@80
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289 lua_setfield(L, -4, "handle");
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jbe@79
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290 lua_setfield(L, -2, "__index");
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jbe@79
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291 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
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jbe@79
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292
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jbe@79
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293 lua_newtable(L); // handle metatable
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jbe@79
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294 luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);
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jbe@79
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295 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);
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jbe@79
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296
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jbe@79
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297 luaL_setfuncs(L, moonbr_io_module_funcs, 0);
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jbe@79
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298 return 1;
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jbe@79
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299
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jbe@79
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300 }
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jbe@79
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301
|