* This is copy-pasted from the backend readTimeLineHistory, modified to * return a malloc'd array and to work without backend functions. */ * Try to read a timeline's history file. * * If successful, return the list of component TLIs (the given TLI followed by * its ancestor TLIs). If we can't find the history file, assume that the * timeline has no parents, and return a list of just the sp
| 26 | * ID. |
| 27 | */ |
| 28 | TimeLineHistoryEntry * |
| 29 | rewind_parseTimeLineHistory(char *buffer, TimeLineID targetTLI, int *nentries) |
| 30 | { |
| 31 | char *fline; |
| 32 | TimeLineHistoryEntry *entry; |
| 33 | TimeLineHistoryEntry *entries = NULL; |
| 34 | int nlines = 0; |
| 35 | TimeLineID lasttli = 0; |
| 36 | XLogRecPtr prevend; |
| 37 | char *bufptr; |
| 38 | bool lastline = false; |
| 39 | |
| 40 | /* |
| 41 | * Parse the file... |
| 42 | */ |
| 43 | prevend = InvalidXLogRecPtr; |
| 44 | bufptr = buffer; |
| 45 | while (!lastline) |
| 46 | { |
| 47 | char *ptr; |
| 48 | TimeLineID tli; |
| 49 | uint32 switchpoint_hi; |
| 50 | uint32 switchpoint_lo; |
| 51 | int nfields; |
| 52 | |
| 53 | fline = bufptr; |
| 54 | while (*bufptr && *bufptr != '\n') |
| 55 | bufptr++; |
| 56 | if (!(*bufptr)) |
| 57 | lastline = true; |
| 58 | else |
| 59 | *bufptr++ = '\0'; |
| 60 | |
| 61 | /* skip leading whitespace and check for # comment */ |
| 62 | for (ptr = fline; *ptr; ptr++) |
| 63 | { |
| 64 | if (!isspace((unsigned char) *ptr)) |
| 65 | break; |
| 66 | } |
| 67 | if (*ptr == '\0' || *ptr == '#') |
| 68 | continue; |
| 69 | |
| 70 | nfields = sscanf(fline, "%u\t%X/%X", &tli, &switchpoint_hi, &switchpoint_lo); |
| 71 | |
| 72 | if (nfields < 1) |
| 73 | { |
| 74 | /* expect a numeric timeline ID as first field of line */ |
| 75 | pg_log_error("syntax error in history file: %s", fline); |
| 76 | pg_log_error("Expected a numeric timeline ID."); |
| 77 | exit(1); |
| 78 | } |
| 79 | if (nfields != 3) |
| 80 | { |
| 81 | pg_log_error("syntax error in history file: %s", fline); |
| 82 | pg_log_error("Expected a write-ahead log switchpoint location."); |
| 83 | exit(1); |
| 84 | } |
| 85 | if (entries && tli <= lasttli) |
no test coverage detected