make empty RE's work, some minor cleanups, too

[unix-history] / usr / src / usr.bin / sed / defs.h

/*-
* Copyright (c) 1992 Diomidis Spinellis.
* Copyright (c) 1992 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Diomidis Spinellis of Imperial College, University of London.
*
* %sccs.include.redist.c%
*
*      @(#)defs.h      5.2 (Berkeley) %G%
*/

/*
* Types of address specifications
*/
enum e_atype {
       AT_RE,                                  /* Line that match RE */
       AT_LINE,                                /* Specific line */
       AT_LAST,                                /* Last line */
};

/*
* Format of an address
*/
struct s_addr {
       enum e_atype type;                      /* Address type */
       union {
               u_long l;                       /* Line number */
               regex_t *r;                     /* Regular expression */
       } u;
};

/*
* Substitution command
*/
struct s_subst {
       int n;                                  /* Occurrence to subst. */
       int p;                                  /* True if p flag */
       char *wfile;                            /* NULL if no wfile */
       int wfd;                                /* Cached file descriptor */
       regex_t *re;                            /* Regular expression */
       regmatch_t *pmatch;                     /* Array of match strucs */
       int maxbref;                            /* Largest backreference. */
       u_long linenum;                         /* Line number. */
       char *new;                              /* Replacement text */
};


/*
* An internally compiled command.
* Initialy, label references are stored in u.t, on a second pass they
* are updated to pointers.
*/
struct s_command {
       struct s_command *next;                 /* Pointer to next command */
       struct s_addr *a1, *a2;                 /* Start and end address */
       char *t;                                /* Text for : a c i r w */
       union {
               struct s_command *c;            /* Command(s) for b t { */
               struct s_subst *s;              /* Substitute command */
               u_char *y;                      /* Replace command array */
               int fd;                         /* File descriptor for w */
       } u;
       char code;                              /* Command code */
       u_int nonsel:1;                         /* True if ! */
       u_int inrange:1;                        /* True if in range */
};

/*
* Types of command arguments recognised by the parser
*/
enum e_args {
       EMPTY,                  /* d D g G h H l n N p P q x = \0 */
       TEXT,                   /* a c i */
       NONSEL,                 /* ! */
       GROUP,                  /* { */
       COMMENT,                /* # */
       BRANCH,                 /* b t */
       LABEL,                  /* : */
       RFILE,                  /* r */
       WFILE,                  /* w */
       SUBST,                  /* s */
       TR                      /* y */
};

/*
* Structure containing things to append before a line is read
*/
struct s_appends {
       enum {AP_STRING, AP_FILE} type;
       char *s;
};

/*
* Error severity codes:
*/
#define FATAL           0       /* Exit immediately with 1 */
#define ERROR           1       /* Continue, but change exit value */
#define WARNING         2       /* Just print the warning */
#define COMPILE         3       /* Print error, count and finish script */
#define COMPILE2        3       /* Print error, count and finish script */