209 lines
9.2 KiB
C
209 lines
9.2 KiB
C
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/* pparse.h */
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/* Copyright (c) 1992, 1993 by the University of Southern California
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For copying information, see the file <usc-copyr.h>
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*/
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#ifndef PPARSE_H_INCLUDED
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#define PPARSE_H_INCLUDED
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#include <usc-copyr.h>
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#ifndef FILE
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#include <stdio.h>
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#endif
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#ifndef PFS_SW_ID
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#include <pfs.h>
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#endif
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#include <stddef.h>
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#include <stdarg.h>
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#include <ardp.h>
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/* This structure is used by the parsing code. It defines a standard IO type
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that lets the parsing code know where to read its input from. This code is
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shared among the client protocol interface, server protocol interface, and
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server directory format reading mechanism. All information about the next
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location to read input from is contained INSIDE this structure.
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That means that if we make a duplicate of the structure (using input_copy())
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and feed it to a function that resets the pointer (e.g., in_inc(), or
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in_line()), the input pointer will be reset for the copy but not for the
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original.
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If there are any data structures which have been allocated for an INPUT,
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then input_freelinks() will free them. At the moment, this is a null
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macro.
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The user is responsible for freeing any memory that the user passed to
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rreqtoin() or filetoin(). The sending functions will normally do this, as
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will fclose().
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The only low-level functions that actually read from this all eventually
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call in_readc() and in_readcahead() and in_incc().
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*/
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enum iotype {IO_UNSET = 0, IO_RREQ, IO_STRING, IO_FILE, IO_BSTRING};
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struct input {
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enum iotype sourcetype;
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RREQ rreq; /* server or client reading */
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struct ptext *inpkt; /* packet in process. Null iff no more input.
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*/
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char *ptext_ioptr; /* position of next character from within ptxt.
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This will point to a null iff there is no
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more input. */
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const char *s; /* Current position in string or bstring */
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FILE *file; /* server, set if reading via dsrfile() or
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dsrdir() */
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long bstring_length; /* Length of the bstring. */
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long offset; /* Offset from start of file or input stream.
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This is repeatedly set and tested.
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Used to make sure that having two INPUT
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variables referring to the same FILE with
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different read pointers will not cause
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problems. Also used in in_line() to
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allocate appropriate memory. */
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/* Also used for BSTRINGs to see how much data
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is still readable. */
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int flags;
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#define CONSUME_INPUT 0x1 /* qscanf() should consume input.
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Not currently implemented. */
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#define PERCENT_R_TARGET_IS_STRING 0x2 /* if set, the target for %r is a
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string. Otherwise, it's an IN.
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This is temporarily set by the
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qsscanf() interface to qscanf()
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*/
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#define JUST_INITIALIZED 0x4 /* set upon initialization.
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Not currently used. */
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#define SERVER_DATA_FILE 0x8 /* A server data file,
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whether Cached by the
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wholefiletoin() or treated in
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raw form by the (unused)
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filetoin() interface. */
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};
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typedef struct input INPUT_ST;
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typedef struct input *INPUT;
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/* Copy the whole schmeer. */
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#define input_copy(src,dest) do { \
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*dest = *src; \
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} while (0)
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#define input_freelinks() do ; while (0)
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/* All of these input functions, except for input_line, report their errors to
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their callers. */
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/* in_line does not do this, though. */
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/* Set up for input. Fills in its 2nd argument. Found in lib/pfs/in_line.c */
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extern void rreqtoin(RREQ rreq, INPUT in);
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extern void filetoin(FILE *file, INPUT in);
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extern int wholefiletoin(FILE *file, INPUT in);
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/* These are the low-level input routines. */
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/* This replaces in_line(), eventually. */
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extern int qscanf(INPUT in, const char fmt[], ...);
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extern int vqscanf(INPUT in, const char fmt[], va_list ap);
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extern int in_line(INPUT in, char **commandp, char **next_wordp);
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extern char *in_nextline(INPUT in); /* returns the command that the next
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in_line would read. Just the first
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word is enough. NULL If no more
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stuff. */
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extern int in_readc(INPUT in);
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extern int in_readcahead(INPUT in, int howfar);
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extern void in_incc(INPUT in);
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extern int in_eof(INPUT in); /* test for EOF status. 1 if true; 0 if not.
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*/
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/* These handy little functions parse input for us. */
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extern int in_acl(INPUT in, ACL *aclp);
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extern int in_ge1_acl(INPUT in, char *command, char *next_word, ACL *aclp);
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extern int in_atr_data(INPUT in, char *command, char *next_word, int nesting,
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PATTRIB at);
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extern int in_atrs(INPUT in, int nesting, PATTRIB *valuep);
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extern int in_ge1_atrs(INPUT in, char *command, char *next_word,
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PATTRIB *valuep);
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extern int in_filter(INPUT in, char *command, char *next_word, int nesting,
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FILTER *valuep);
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extern int in_forwarded_data(INPUT in, char *command, char *next_word,
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VLINK dlink);
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extern int in_id(INPUT in, long *magic_nop);
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extern int in_select(INPUT in, long *magic_nop);
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extern int in_link(INPUT in, char *command, char *next_word, int nesting,
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VLINK *valuep, TOKEN *argsp);
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extern int in_sequence(INPUT in, char *command, char *next_word,
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TOKEN *valuep);
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/* Used to look at error messages */
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extern int scan_error(char *line, RREQ req);
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/* This structure is used by the formatting code. It defines a standard
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output type that lets the formatting code know where to send the output.
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*/
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struct output {
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RREQ req; /* Server -- replying to client request */
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RREQ request; /* Client -- querying the server */
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FILE *f; /* Server, writing to dsfile.c or dsdir.c */
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/* No need for string output. */
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};
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typedef struct output *OUTPUT;
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typedef struct output OUTPUT_ST;
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/* requesttoout() and reqtoout() are inherently different, because libardp has
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an asymmetry between a client sending a request to a server and a server
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replying to a client's request.
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Requests to the server are sent as a unit, whereas replies are returned a
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packet at a time as data becomes available. Also, the functions they use to
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push the output & terminate the request are different.
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*/
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/* Automatic reply and formatting utilities (unparsing, sort of :)). */
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/* Set up for output. Fills in its 2nd argument.*/
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/* lib/pfs/cl_qoprintf.c */
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extern int requesttoout(RREQ req, OUTPUT out);
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/* lib/psrv/srv_qoprintf.c */
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extern void reqtoout(RREQ req, OUTPUT out);
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extern void filetoout(FILE *file, OUTPUT out);
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/* outputs raw lines and data. */
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extern int (*qoprintf)(OUTPUT out, const char format[], ...);
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/* set to one of the two below. */
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extern int cl_qoprintf(OUTPUT out, const char format[], ...);
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extern int srv_qoprintf(OUTPUT out, const char format[], ...);
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/* outputs formatted stuff. */
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extern int out_acl(OUTPUT out, ACL acl);
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extern int out_atr(OUTPUT out, PATTRIB at, int nesting);
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extern int out_atrs(OUTPUT out, PATTRIB at, int nesting);
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extern int out_filter(OUTPUT out, FILTER fil, int nesting);
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extern int out_link(OUTPUT out, VLINK vlink, int nesting, TOKEN args);
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extern int out_sequence(OUTPUT out, TOKEN tk);
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/* in LIBPSRV. */
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/* Attribute manipulation stuff that is used by the parsing code too. */
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/* These report errors by writing to p_err_string and returning error codes. */
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/* Used by in_link() in LIBPFS and by edit_link_info() in the server. */
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extern int vl_add_atrs(PATTRIB at, VLINK clink);
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extern int vl_add_atr(PATTRIB at, VLINK clink);
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extern void vl_atput(VLINK vl, char *name, ...);
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/* Used ONLY by in_atrs() and atr_out() */
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/* used by atr_out() */
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extern char * lookup_precedencename_by_precedence(int precedence);
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extern char * lookup_avtypename_by_avtype(int avtype);
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/* used by in_atrs() */
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extern int lookup_avtype_by_field_name(const char aname[]);
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extern int lookup_precedence_by_precedencename(const char t_precedence[]);
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extern int lookup_avtype_by_avtypename(const char []);
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/* This variable is set to the real function in the stdio library if you
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want the IN package to deal with input streams as defined in <stdio.h>.
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They are set by dirsrv.c and by shadowcvt.c
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They should be set when you set qoprintf().
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*/
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extern int (*stdio_fseek)();
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#endif /* PPARSE_H_INCLUDED */
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