3 * fmt_scan.h -- definitions for fmt_scan()
9 * This structure describes an "interesting" component. It holds
10 * the name & text from the component (if found) and one piece of
11 * auxilary info. The structure for a particular component is located
12 * by (open) hashing the name and using it as an index into the ptr array
13 * "wantcomp". All format entries that reference a particular component
14 * point to its comp struct (so we only have to do component specific
15 * processing once. e.g., parse an address.).
18 char *c_name; /* component name (in lower case) */
19 char *c_text; /* component text (if found) */
20 struct comp *c_next; /* hash chain linkage */
21 short c_flags; /* misc. flags (from fmt_scan) */
22 short c_type; /* type info (from fmt_compile) */
25 struct mailname *c_u_mn;
29 #define c_tws c_un.c_u_tws
30 #define c_mn c_un.c_u_mn
35 #define CT_ADDR (1<<0) /* referenced as address */
36 #define CT_DATE (1<<1) /* referenced as date */
37 #define CT_MYMBOX (1<<2) /* "mymbox" test being done */
38 #define CT_ADDRPARSE (1<<3) /* address parse being done */
43 * Hash table for deciding if a component is "interesting".
45 extern struct comp *wantcomp[128];
48 * Hash function for component name. The function should be
49 * case independent and probably shouldn't involve a routine
50 * call. This function is pretty good but will not work on
51 * single character component names.
53 #define CHASH(nm) (((((nm)[0]) - ((nm)[1])) & 0x1f) + (((nm)[2]) & 0x5f))
56 * Find a component in the hash table.
58 #define FINDCOMP(comp,name) \
59 for (comp = wantcomp[CHASH(name)]; \
60 comp && strcmp(comp->c_name,name); \
61 comp = comp->c_next) ;
64 * This structure defines one formatting instruction.
69 short f_width; /* output field width */
71 struct comp *f_u_comp; /* associated component */
72 char *f_u_text; /* literal text */
73 char f_u_char; /* literal character */
74 int f_u_value; /* literal value */
78 #define f_skip f_width /* instr to skip (false "if") */
80 #define f_comp f_un.f_u_comp
81 #define f_text f_un.f_u_text
82 #define f_char f_un.f_u_char
83 #define f_value f_un.f_u_value
88 struct format *fmt_scan (struct format *, char *, int, int *);
89 char *new_fs (char *, char *, char *);
90 int fmt_compile (char *, struct format **);