1 |
/* |
2 |
* Cisco router simulation platform. |
3 |
* Copyright (c) 2007 Christophe Fillot (cf@utc.fr) |
4 |
* |
5 |
* ROMMON Environment Variables. |
6 |
*/ |
7 |
#include <stdio.h> |
8 |
#include <stdlib.h> |
9 |
#include <string.h> |
10 |
#include <unistd.h> |
11 |
#include <errno.h> |
12 |
|
13 |
#include "utils.h" |
14 |
#include "rommon_var.h" |
15 |
|
16 |
/* Load file containing ROMMON variables */ |
17 |
int rommon_load_file(struct rommon_var_list *rvl) |
18 |
{ |
19 |
char buffer[512]; |
20 |
FILE *fd; |
21 |
|
22 |
if (!rvl->filename) |
23 |
return(-1); |
24 |
|
25 |
if (!(fd = fopen(rvl->filename,"r"))) { |
26 |
fprintf(stderr,"%s: unable to create file %s (%s)\n", |
27 |
__func__,rvl->filename,strerror(errno)); |
28 |
return(-1); |
29 |
} |
30 |
|
31 |
while(!feof(fd)) { |
32 |
if (m_fgets(buffer,sizeof(buffer),fd)) |
33 |
rommon_var_add_str(rvl,buffer); |
34 |
} |
35 |
|
36 |
fclose(fd); |
37 |
return(0); |
38 |
} |
39 |
|
40 |
/* Write a file with all ROMMON variables */ |
41 |
int rommon_var_update_file(struct rommon_var_list *rvl) |
42 |
{ |
43 |
struct rommon_var *var; |
44 |
FILE *fd; |
45 |
|
46 |
if (!rvl->filename) |
47 |
return(-1); |
48 |
|
49 |
if (!(fd = fopen(rvl->filename,"w"))) { |
50 |
fprintf(stderr,"%s: unable to create file %s (%s)\n", |
51 |
__func__,rvl->filename,strerror(errno)); |
52 |
return(-1); |
53 |
} |
54 |
|
55 |
for(var=rvl->var_list;var;var=var->next) |
56 |
fprintf(fd,"%s=%s\n",var->name,var->value ? var->value : ""); |
57 |
|
58 |
fclose(fd); |
59 |
return(0); |
60 |
} |
61 |
|
62 |
/* Find the specified variable */ |
63 |
struct rommon_var *rommon_var_find(struct rommon_var_list *rvl,char *name) |
64 |
{ |
65 |
struct rommon_var *var; |
66 |
|
67 |
for(var=rvl->var_list;var;var=var->next) |
68 |
if (!strcmp(var->name,name)) |
69 |
return var; |
70 |
|
71 |
return NULL; |
72 |
} |
73 |
|
74 |
/* Create a new variable */ |
75 |
static struct rommon_var *rommon_var_create(char *name) |
76 |
{ |
77 |
struct rommon_var *var; |
78 |
|
79 |
if (!(var = malloc(sizeof(*var)))) |
80 |
return NULL; |
81 |
|
82 |
var->next = NULL; |
83 |
var->value = NULL; |
84 |
var->name = strdup(name); |
85 |
|
86 |
if (!var->name) { |
87 |
free(var); |
88 |
return NULL; |
89 |
} |
90 |
|
91 |
return var; |
92 |
} |
93 |
|
94 |
/* Set value for a variable */ |
95 |
static int rommon_var_set(struct rommon_var *var,char *value) |
96 |
{ |
97 |
char *new_value; |
98 |
|
99 |
if (!(new_value = strdup(value))) |
100 |
return(-1); |
101 |
|
102 |
/* free old value */ |
103 |
if (var->value) |
104 |
free(var->value); |
105 |
|
106 |
var->value = new_value; |
107 |
return(0); |
108 |
} |
109 |
|
110 |
/* Add a new variable */ |
111 |
int rommon_var_add(struct rommon_var_list *rvl,char *name,char *value) |
112 |
{ |
113 |
struct rommon_var *var; |
114 |
|
115 |
/* if the variable already exists, overwrite it */ |
116 |
if (!(var = rommon_var_find(rvl,name))) { |
117 |
var = rommon_var_create(name); |
118 |
if (!var) return(-1); |
119 |
|
120 |
if (rommon_var_set(var,value) == -1) |
121 |
return(-1); |
122 |
|
123 |
var->next = rvl->var_list; |
124 |
rvl->var_list = var; |
125 |
} else { |
126 |
rommon_var_set(var,value); |
127 |
} |
128 |
|
129 |
/* synchronize disk file */ |
130 |
return(rommon_var_update_file(rvl)); |
131 |
} |
132 |
|
133 |
/* |
134 |
* Add a new variable, specified at the format: var=value. |
135 |
* The string is modified. |
136 |
*/ |
137 |
int rommon_var_add_str(struct rommon_var_list *rvl,char *str) |
138 |
{ |
139 |
char *eq_sym; |
140 |
|
141 |
if (!(eq_sym = strchr(str,'='))) |
142 |
return(-1); |
143 |
|
144 |
/* The variable cannot be null */ |
145 |
if (str == eq_sym) |
146 |
return(-1); |
147 |
|
148 |
*eq_sym = 0; |
149 |
return(rommon_var_add(rvl,str,eq_sym+1)); |
150 |
} |
151 |
|
152 |
/* Get the specified variable */ |
153 |
int rommon_var_get(struct rommon_var_list *rvl,char *name, |
154 |
char *buffer,size_t len) |
155 |
{ |
156 |
struct rommon_var *var; |
157 |
|
158 |
if (!(var = rommon_var_find(rvl,name)) || !var->value) |
159 |
return(-1); |
160 |
|
161 |
strncpy(buffer,var->value,len-1); |
162 |
buffer[len-1] = '\0'; |
163 |
return(0); |
164 |
} |