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 */
41 #define CF_TRUE (1<<0) /* usually means component is present */
42 #define CF_PARSED (1<<1) /* address/date has been parsed */
43 #define CF_DATEFAB (1<<2) /* datefield fabricated */
48 * Hash table for deciding if a component is "interesting".
50 extern struct comp *wantcomp[128];
53 * Hash function for component name. The function should be
54 * case independent and probably shouldn't involve a routine
55 * call. This function is pretty good but will not work on
56 * single character component names.
58 #define CHASH(nm) (((((nm)[0]) - ((nm)[1])) & 0x1f) + (((nm)[2]) & 0x5f))
61 * Find a component in the hash table.
63 #define FINDCOMP(comp,name) \
64 for (comp = wantcomp[CHASH(name)]; \
65 comp && strcmp(comp->c_name,name); \
66 comp = comp->c_next) ;
69 * This structure defines one formatting instruction.
74 short f_width; /* output field width */
76 struct comp *f_u_comp; /* associated component */
77 char *f_u_text; /* literal text */
78 char f_u_char; /* literal character */
79 int f_u_value; /* literal value */
83 #define f_skip f_width /* instr to skip (false "if") */
85 #define f_comp f_un.f_u_comp
86 #define f_text f_un.f_u_text
87 #define f_char f_un.f_u_char
88 #define f_value f_un.f_u_value
93 struct format *fmt_scan (struct format *, char *, int, int *);
94 char *new_fs (char *, char *, char *);
95 int fmt_compile (char *, struct format **);