comparison: pdcurses/scr_dump.c
pdcurses/scr_dump.c
- changeset 97
- 2d43f05b284c
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| 96:5314ebdcb38d | 97:2d43f05b284c |
|---|---|
| 1 /* Public Domain Curses */ | |
| 2 | |
| 3 #include <curspriv.h> | |
| 4 | |
| 5 RCSID("$Id: scr_dump.c,v 1.30 2008/07/13 16:08:18 wmcbrine Exp $") | |
| 6 | |
| 7 /*man-start************************************************************** | |
| 8 | |
| 9 Name: scr_dump | |
| 10 | |
| 11 Synopsis: | |
| 12 int putwin(WINDOW *win, FILE *filep); | |
| 13 WINDOW *getwin(FILE *filep); | |
| 14 int scr_dump(const char *filename); | |
| 15 int scr_init(const char *filename); | |
| 16 int scr_restore(const char *filename); | |
| 17 int scr_set(const char *filename); | |
| 18 | |
| 19 Description: | |
| 20 getwin() reads window-related data previously stored in a file | |
| 21 by putwin(). It then creates and initialises a new window using | |
| 22 that data. | |
| 23 | |
| 24 putwin() writes all data associated with a window into a file, | |
| 25 using an unspecified format. This information can be retrieved | |
| 26 later using getwin(). | |
| 27 | |
| 28 scr_dump() writes the current contents of the virtual screen to | |
| 29 the file named by filename in an unspecified format. | |
| 30 | |
| 31 scr_restore() function sets the virtual screen to the contents | |
| 32 of the file named by filename, which must have been written | |
| 33 using scr_dump(). The next refresh operation restores the screen | |
| 34 to the way it looked in the dump file. | |
| 35 | |
| 36 In PDCurses, scr_init() does nothing, and scr_set() is a synonym | |
| 37 for scr_restore(). Also, scr_dump() and scr_restore() save and | |
| 38 load from curscr. This differs from some other implementations, | |
| 39 where scr_init() works with curscr, and scr_restore() works with | |
| 40 newscr; but the effect should be the same. (PDCurses has no | |
| 41 newscr.) | |
| 42 | |
| 43 Return Value: | |
| 44 On successful completion, getwin() returns a pointer to the | |
| 45 window it created. Otherwise, it returns a null pointer. Other | |
| 46 functions return OK or ERR. | |
| 47 | |
| 48 Portability X/Open BSD SYS V | |
| 49 putwin Y | |
| 50 getwin Y | |
| 51 scr_dump Y | |
| 52 scr_init Y | |
| 53 scr_restore Y | |
| 54 scr_set Y | |
| 55 | |
| 56 **man-end****************************************************************/ | |
| 57 | |
| 58 #include <stdlib.h> | |
| 59 #include <string.h> | |
| 60 | |
| 61 #define DUMPVER 1 /* Should be updated whenever the WINDOW struct is | |
| 62 changed */ | |
| 63 | |
| 64 int putwin(WINDOW *win, FILE *filep) | |
| 65 { | |
| 66 static const char *marker = "PDC"; | |
| 67 static const unsigned char version = DUMPVER; | |
| 68 | |
| 69 PDC_LOG(("putwin() - called\n")); | |
| 70 | |
| 71 /* write the marker and the WINDOW struct */ | |
| 72 | |
| 73 if (filep && fwrite(marker, strlen(marker), 1, filep) | |
| 74 && fwrite(&version, 1, 1, filep) | |
| 75 && fwrite(win, sizeof(WINDOW), 1, filep)) | |
| 76 { | |
| 77 int i; | |
| 78 | |
| 79 /* write each line */ | |
| 80 | |
| 81 for (i = 0; i < win->_maxy && win->_y[i]; i++) | |
| 82 if (!fwrite(win->_y[i], win->_maxx * sizeof(chtype), 1, filep)) | |
| 83 return ERR; | |
| 84 | |
| 85 return OK; | |
| 86 } | |
| 87 | |
| 88 return ERR; | |
| 89 } | |
| 90 | |
| 91 WINDOW *getwin(FILE *filep) | |
| 92 { | |
| 93 WINDOW *win; | |
| 94 char marker[4]; | |
| 95 int i, nlines, ncols; | |
| 96 | |
| 97 PDC_LOG(("getwin() - called\n")); | |
| 98 | |
| 99 if ( !(win = malloc(sizeof(WINDOW))) ) | |
| 100 return (WINDOW *)NULL; | |
| 101 | |
| 102 /* check for the marker, and load the WINDOW struct */ | |
| 103 | |
| 104 if (!filep || !fread(marker, 4, 1, filep) || strncmp(marker, "PDC", 3) | |
| 105 || marker[3] != DUMPVER || !fread(win, sizeof(WINDOW), 1, filep)) | |
| 106 { | |
| 107 free(win); | |
| 108 return (WINDOW *)NULL; | |
| 109 } | |
| 110 | |
| 111 nlines = win->_maxy; | |
| 112 ncols = win->_maxx; | |
| 113 | |
| 114 /* allocate the line pointer array */ | |
| 115 | |
| 116 if ( !(win->_y = malloc(nlines * sizeof(chtype *))) ) | |
| 117 { | |
| 118 free(win); | |
| 119 return (WINDOW *)NULL; | |
| 120 } | |
| 121 | |
| 122 /* allocate the minchng and maxchng arrays */ | |
| 123 | |
| 124 if ( !(win->_firstch = malloc(nlines * sizeof(int))) ) | |
| 125 { | |
| 126 free(win->_y); | |
| 127 free(win); | |
| 128 return (WINDOW *)NULL; | |
| 129 } | |
| 130 | |
| 131 if ( !(win->_lastch = malloc(nlines * sizeof(int))) ) | |
| 132 { | |
| 133 free(win->_firstch); | |
| 134 free(win->_y); | |
| 135 free(win); | |
| 136 return (WINDOW *)NULL; | |
| 137 } | |
| 138 | |
| 139 /* allocate the lines */ | |
| 140 | |
| 141 if ( !(win = PDC_makelines(win)) ) | |
| 142 return (WINDOW *)NULL; | |
| 143 | |
| 144 /* read them */ | |
| 145 | |
| 146 for (i = 0; i < nlines; i++) | |
| 147 { | |
| 148 if (!fread(win->_y[i], ncols * sizeof(chtype), 1, filep)) | |
| 149 { | |
| 150 delwin(win); | |
| 151 return (WINDOW *)NULL; | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 touchwin(win); | |
| 156 | |
| 157 return win; | |
| 158 } | |
| 159 | |
| 160 int scr_dump(const char *filename) | |
| 161 { | |
| 162 FILE *filep; | |
| 163 | |
| 164 PDC_LOG(("scr_dump() - called: filename %s\n", filename)); | |
| 165 | |
| 166 if (filename && (filep = fopen(filename, "wb")) != NULL) | |
| 167 { | |
| 168 int result = putwin(curscr, filep); | |
| 169 fclose(filep); | |
| 170 return result; | |
| 171 } | |
| 172 | |
| 173 return ERR; | |
| 174 } | |
| 175 | |
| 176 int scr_init(const char *filename) | |
| 177 { | |
| 178 PDC_LOG(("scr_init() - called: filename %s\n", filename)); | |
| 179 | |
| 180 return OK; | |
| 181 } | |
| 182 | |
| 183 int scr_restore(const char *filename) | |
| 184 { | |
| 185 FILE *filep; | |
| 186 | |
| 187 PDC_LOG(("scr_restore() - called: filename %s\n", filename)); | |
| 188 | |
| 189 if (filename && (filep = fopen(filename, "rb")) != NULL) | |
| 190 { | |
| 191 WINDOW *replacement = getwin(filep); | |
| 192 fclose(filep); | |
| 193 | |
| 194 if (replacement) | |
| 195 { | |
| 196 int result = overwrite(replacement, curscr); | |
| 197 delwin(replacement); | |
| 198 return result; | |
| 199 } | |
| 200 } | |
| 201 | |
| 202 return ERR; | |
| 203 } | |
| 204 | |
| 205 int scr_set(const char *filename) | |
| 206 { | |
| 207 PDC_LOG(("scr_set() - called: filename %s\n", filename)); | |
| 208 | |
| 209 return scr_restore(filename); | |
| 210 } |
