Edit File: load.c
/*- * See the file LICENSE for redistribution information. * * Copyright (c) 2005,2008 Oracle. All rights reserved. * * $Id: load.c,v 1.12 2008/01/08 20:58:23 bostic Exp $ */ #include "csv.h" #include "csv_local.h" #include "csv_extern.h" typedef enum { GL_OK, GL_EOF, GL_FAIL } getline_status; static int input_field_count(const char *, size_t, u_int32_t *); static getline_status input_getline(char **, size_t *, size_t *); static int input_put_alloc(u_int32_t **, size_t *, size_t, u_int32_t); static int input_set_offset(u_int32_t *, char *, size_t, u_int32_t); static input_fmt ifmt; /* Input format. */ static u_long record_count = 0; /* Input record count for errors. */ static u_long version; /* Version we're loading. */ /* * input_load -- * Read the input file and load new records into the database. */ int input_load(input_fmt ifmt_arg, u_long version_arg) { getline_status gtl_status; DBT key, data; DBC *cursor; u_int32_t field_count, primary_key, *put_line; size_t input_len, len, put_len; int is_first, ret; char *input_line; field_count = 0; /* Shut the compiler up. */ /* ifmt and version are global to this file. */ ifmt = ifmt_arg; version = version_arg; /* * The primary key for the database is a unique number. Find out the * last unique number allocated in this database by opening a cursor * and fetching the last record. */ if ((ret = db->cursor(db, NULL, &cursor, 0)) != 0) { dbenv->err(dbenv, ret, "DB->cursor"); return (1); } memset(&key, 0, sizeof(key)); memset(&data, 0, sizeof(data)); if ((ret = cursor->c_get(cursor, &key, &data, DB_LAST)) != 0) if (ret == DB_NOTFOUND) primary_key = 0; else { dbenv->err(dbenv, ret, "DB->cursor: DB_LAST"); return (1); } else memcpy(&primary_key, key.data, sizeof(primary_key)); if ((ret = cursor->c_close(cursor)) != 0) { dbenv->err(dbenv, ret, "DBC->close"); return (1); } if (verbose) dbenv->errx(dbenv, "maximum existing record in the database is %lu", (u_long)primary_key); key.data = &primary_key; key.size = sizeof(primary_key); input_line = NULL; put_line = NULL; input_len = put_len = 0; /* * See the README file for a description of the file input format. */ for (is_first = 1; (gtl_status = input_getline(&input_line, &input_len, &len)) == GL_OK;) { ++record_count; if (verbose > 1) dbenv->errx(dbenv, "reading %lu", (u_long)record_count); /* The first non-blank line of the input is a column map. */ if (is_first) { is_first = 0; /* Count the fields we're expecting in the input. */ if (input_field_count( input_line, len, &field_count) != 0) return (1); } /* Allocate room for the table of offsets. */ if (input_put_alloc( &put_line, &put_len, len, field_count) != 0) return (1); /* * Build the offset table and create the record we're * going to store. */ if (input_set_offset(put_line, input_line, len, field_count) != 0) return (1); ++primary_key; memcpy(put_line + (field_count + 2), input_line, len); data.data = put_line; data.size = (field_count + 2) * sizeof(u_int32_t) + len; if (verbose > 1) (void)entry_print( data.data, data.size, field_count); /* Load the key/data pair into the database. */ if ((ret = db->put(db, NULL, &key, &data, 0)) != 0) { dbenv->err(dbenv, ret, "DB->put: %lu", (u_long)primary_key); return (1); } } if (gtl_status != GL_EOF) return (1); if (verbose) dbenv->errx(dbenv, "%lu records read from the input file into the database", record_count); /* * This program isn't transactional, limit the window for corruption. */ if ((ret = db->sync(db, 0)) != 0) { dbenv->err(dbenv, ret, "DB->sync"); return (1); } return (0); } /* * input_getline -- * Read in a line of input into a buffer. */ static getline_status input_getline(char **input_linep, size_t *input_lenp, size_t *lenp) { size_t input_len, len; int ch; char *input_line, *p, *endp; input_line = *input_linep; input_len = *input_lenp; p = input_line; endp = input_line + input_len; for (len = 0; (ch = getchar()) != EOF;) { if (ch == '\0') /* Strip <nul> (\000) bytes. */ continue; switch (ifmt) { case FORMAT_NL: if (ch == '\n') goto end; break; case FORMAT_EXCEL: /* Strip <nl> (\012) bytes. */ if (ch == '\n') continue; /* * <cr> (\015) bytes terminate lines. * Skip blank lines. */ if (ch == '\015') { if (len == 0) continue; goto end; } } if (input_line == endp) { input_len += 256; input_len *= 2; if ((input_line = realloc(input_line, input_len)) == NULL) { dbenv->err(dbenv, errno, "unable to allocate %lu bytes for record", (u_long)input_len); return (GL_FAIL); } p = input_line; endp = p + input_len; } if (isprint(ch)) { /* Strip unprintables. */ *p++ = (char)ch; ++len; } } end: if (len == 0) return (GL_EOF); *lenp = len; *input_linep = input_line; *input_lenp = input_len; return (GL_OK); } /* * input_field_count -- * Count the fields in the line. */ static int input_field_count(const char *line, size_t len, u_int32_t *field_countp) { u_int32_t field_count; int quoted; field_count = 1; /* * There are N-1 separators for N fields, that is, "a,b,c" is three * fields, with two comma separators. */ switch (ifmt) { case FORMAT_EXCEL: quoted = 0; for (field_count = 1; len > 0; ++line, --len) if (*line == '"') quoted = !quoted; else if (*line == ',' && !quoted) ++field_count; break; case FORMAT_NL: for (field_count = 1; len > 0; ++line, --len) if (*line == ',') ++field_count; break; } *field_countp = field_count; if (verbose) dbenv->errx(dbenv, "input file made up of %lu fields", (u_int)field_count); return (0); } /* * input_put_alloc -- * Allocate room for the offset table plus the input. */ static int input_put_alloc(u_int32_t **put_linep, size_t *put_lenp, size_t len, u_int32_t field_count) { size_t total; total = (field_count + 2) * sizeof(u_int32_t) + len; if (total > *put_lenp && (*put_linep = realloc(*put_linep, *put_lenp += total)) == NULL) { dbenv->err(dbenv, errno, "unable to allocate %lu bytes for record", (u_long)*put_lenp); return (1); } return (0); } /* * input_set_offset -- * Build an offset table and record combination. */ static int input_set_offset(u_int32_t *put_line, char *input_line, size_t len, u_int32_t field_count) { u_int32_t *op; int quoted; char *p, *endp; op = put_line; /* The first field is the version number. */ *op++ = version; /* * Walk the input line, looking for comma separators. It's an error * to have too many or too few fields. */ *op++ = 0; quoted = 0; for (p = input_line, endp = input_line + len;; ++p) { if (ifmt == FORMAT_EXCEL && p < endp) { if (*p == '"') quoted = !quoted; if (quoted) continue; } if (*p == ',' || p == endp) { if (field_count == 0) { dbenv->errx(dbenv, "record %lu: too many fields in the record", record_count); return (1); } --field_count; *op++ = (u_int32_t)(p - input_line) + 1; if (verbose > 1) dbenv->errx(dbenv, "offset %lu: {%.*s}", op[-1], OFFSET_LEN(op, -2), input_line + op[-2]); /* * Don't insert a new field if the input lines ends * in a comma. */ if (p == endp || p + 1 == endp) break; } } *op++ = (u_int32_t)(p - input_line); if (field_count != 0) { dbenv->errx(dbenv, "record %lu: not enough fields in the record", record_count); return (1); } memcpy(op, input_line, len); return (0); }
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