1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -70,9 +70,14 @@ typedef struct chain_s {
} chain;
/* Function */
+typedef var *(*awk_cfunc)(var *res, var *args, int nargs);
typedef struct func_s {
unsigned nargs;
+ enum { AWKFUNC, CFUNC } type;
+ union {
+ awk_cfunc cfunc;
struct chain_s body;
+ } x;
} func;
/* I/O stream */
@@ -1453,7 +1458,8 @@ static void parse_program(char *p)
next_token(TC_FUNCTION);
g_pos++;
f = newfunc(t_string);
- f->body.first = NULL;
+ f->type = AWKFUNC;
+ f->x.body.first = NULL;
f->nargs = 0;
while (next_token(TC_VARIABLE | TC_SEQTERM) & TC_VARIABLE) {
v = findvar(ahash, t_string);
@@ -1462,7 +1468,7 @@ static void parse_program(char *p)
if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM)
break;
}
- seq = &f->body;
+ seq = &f->x.body;
chain_group();
clear_array(ahash);
@@ -2547,7 +2553,8 @@ static var *evaluate(node *op, var *res)
var *vbeg, *v;
const char *sv_progname;
- if (!op->r.f->body.first)
+ if ((op->r.f->type == AWKFUNC) &&
+ !op->r.f->x.body.first)
syntax_error(EMSG_UNDEF_FUNC);
vbeg = v = nvalloc(op->r.f->nargs + 1);
@@ -2564,7 +2571,10 @@ static var *evaluate(node *op, var *res)
fnargs = vbeg;
sv_progname = g_progname;
- res = evaluate(op->r.f->body.first, res);
+ if (op->r.f->type == AWKFUNC)
+ res = evaluate(op->r.f->x.body.first, res);
+ else if (op->r.f->type == CFUNC)
+ res = op->r.f->x.cfunc(res, fnargs, op->r.f->nargs);
g_progname = sv_progname;
nvfree(fnargs);
@@ -2942,6 +2952,143 @@ static rstream *next_input_file(void)
#undef files_happen
}
+/* read the contents of an entire file */
+static char *get_file(const char *fname)
+{
+ FILE *F;
+ char *s = NULL;
+ int i, j, flen;
+
+ F = fopen(fname, "r");
+ if (!F) {
+ return NULL;
+ }
+
+ if (fseek(F, 0, SEEK_END) == 0) {
+ flen = ftell(F);
+ s = (char *)xmalloc(flen+4);
+ fseek(F, 0, SEEK_SET);
+ i = 1 + fread(s+1, 1, flen, F);
+ } else {
+ for (i=j=1; j>0; i+=j) {
+ s = (char *)xrealloc(s, i+4096);
+ j = fread(s+i, 1, 4094, F);
+ }
+ }
+
+ s[i] = '\0';
+ fclose(F);
+ return s;
+}
+
+
+/* parse_include():
+ *
+ * taken from parse_program from awk.c
+ * END{} is not parsed here, and BEGIN{} is executed immediately
+ */
+static void parse_include(char *p)
+{
+ uint32_t tclass;
+ chain *initseq = NULL;
+ chain tmp;
+ func *f;
+ var *v, *tv;
+
+ tv = nvalloc(1);
+ memset(&tmp, 0, sizeof(tmp));
+ g_pos = p;
+ t_lineno = 1;
+ while ((tclass = next_token(TC_EOF | TC_OPSEQ |
+ TC_OPTERM | TC_BEGIN | TC_FUNCDECL)) != TC_EOF) {
+ if (tclass & TC_OPTERM)
+ continue;
+
+ seq = &tmp;
+ if (tclass & TC_BEGIN) {
+ initseq = xzalloc(sizeof(chain));
+ seq = initseq;
+ chain_group();
+ } else if (tclass & TC_FUNCDECL) {
+ next_token(TC_FUNCTION);
+ g_pos++;
+ f = newfunc(t_string);
+ f->type = AWKFUNC;
+ f->x.body.first = NULL;
+ f->nargs = 0;
+ while (next_token(TC_VARIABLE | TC_SEQTERM) & TC_VARIABLE) {
+ v = findvar(ahash, t_string);
+ v->x.aidx = (f->nargs)++;
+
+ if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM)
+ break;
+ }
+ seq = &(f->x.body);
+ chain_group();
+ clear_array(ahash);
+ }
+ }
+ if (initseq && initseq->first)
+ tv = evaluate(initseq->first, tv);
+ nvfree(tv);
+}
+
+
+/* include an awk file and run its BEGIN{} section */
+static xhash *includes = NULL;
+static void include_file(const char *filename)
+{
+ char *s;
+ var *v;
+ int oldlnr = g_lineno;
+ const char *oldprg = g_progname;
+
+ if (!includes)
+ includes = hash_init();
+
+ /* find out if the file has been included already */
+ v = findvar(includes, filename);
+ if (istrue(v))
+ return;
+ setvar_s(v, "1");
+
+ /* read include file */
+ s = get_file(filename);
+ if (!s) {
+ fprintf(stderr, "Could not open file.\n");
+ return;
+ }
+ g_lineno = 1;
+ g_progname = xstrdup(filename);
+ parse_include(s+1);
+ free(s);
+ g_lineno = oldlnr;
+ g_progname = oldprg;
+}
+
+static var *include(var *res, var *args, int nargs)
+{
+ const char *s;
+
+ nargs = nargs; /* shut up, gcc */
+ s = getvar_s(args);
+ if (s && (strlen(s) > 0))
+ include_file(s);
+
+ return res;
+}
+
+/* registers a global c function for the awk interpreter */
+static void register_cfunc(const char *name, awk_cfunc cfunc, int nargs)
+{
+ func *f;
+
+ f = newfunc(name);
+ f->type = CFUNC;
+ f->x.cfunc = cfunc;
+ f->nargs = nargs;
+}
+
int awk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int awk_main(int argc, char **argv)
{
@@ -3007,6 +3154,9 @@ int awk_main(int argc, char **argv)
*s1 = '=';
}
}
+
+ register_cfunc("include", include, 1);
+
opt_complementary = "v::f::"; /* -v and -f can occur multiple times */
opt = getopt32(argv, "F:v:f:W:", &opt_F, &list_v, &list_f, &opt_W);
argv += optind;
|
