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-rw-r--r--src/lutris.c90
-rw-r--r--src/lutris.h8
2 files changed, 96 insertions, 2 deletions
diff --git a/src/lutris.c b/src/lutris.c
index b80d830..0580818 100644
--- a/src/lutris.c
+++ b/src/lutris.c
@@ -519,3 +519,93 @@ void lutris_freeInstaller(struct script_t* installer)
}
}
}
+
+size_t parseVar(char** pvar, struct list_t* variables, size_t variable_count)
+{
+ char* var = *pvar;
+ char* head = var;
+ char* tail, *end;
+ char* buf, *key;
+
+ size_t varcount = 0;
+
+ while (*head != '\0')
+ {
+ if (*head == VARIABLESIGN)
+ {
+ // ensure sanity by clearing variables
+ buf = NULL;
+ key = NULL;
+
+ end = strlen(var) + var;
+
+ int bufend = (head-var);
+
+ // find variable key
+ tail = ++head;
+ while (*tail <= 'z' && *tail >= 'A') // we ONLY accept ascii variables
+ {
+
+ ++tail;
+ }
+
+ if ((tail-head) > 0)
+ {
+ // resolve variable key and store it
+ buf = malloc(tail-head);
+ strncpy(buf, head, tail-head);
+ for (size_t i = 0; i < variable_count; ++i)
+ {
+ if (strncmp(variables[i].key, buf, tail-head) == 0)
+ {
+ switch (variables[i].type)
+ {
+ case value_string:
+ key = variables[i].value.str;
+ break;
+
+ case value_function:
+ variables[i].value.func();
+ break;
+
+ default:
+ UNREACHABLE
+ break;
+ }
+ }
+ }
+ free(buf);
+ }
+
+ if (!key) continue;
+
+ // copy everything from variable key end to end of string
+ buf = malloc(end-tail+1);
+ strncpy(buf, tail, end-tail+1);
+
+ size_t varsize = (head-var) + strlen(key) + (end-tail) + 1;
+
+ var = realloc(var, varsize);
+ // end of the string up until the variable
+ // we cannot fetch this after the realloc because it points to completly different memory making pointer math impossible
+ var[bufend] = '\0';
+ strncat(var, key, varsize - strlen(var) - 1);
+ strncat(var, buf, varsize - strlen(var) - 1);
+ // cleanup
+ free(buf);
+ buf = NULL;
+
+ varcount++;
+
+ // bring your head back to the world of living memory
+ head = var;
+ }
+
+ head++;
+ }
+
+ // point pvar back to the string
+ *pvar = var;
+
+ return varcount;
+}
diff --git a/src/lutris.h b/src/lutris.h
index d0fe782..bc815c1 100644
--- a/src/lutris.h
+++ b/src/lutris.h
@@ -4,6 +4,8 @@
#include <stddef.h>
#include <json.h>
+#define VARIABLESIGN '$'
+
enum keyword {
MOVE = 0,
MERGE,
@@ -100,8 +102,8 @@ struct file_t {
};
enum value_type_t {
- string,
- function
+ value_string,
+ value_function
};
struct list_t {
@@ -146,4 +148,6 @@ void lutris_getInstallerURL(char*, char*, size_t);
struct script_t lutris_getInstaller(char*);
void lutris_freeInstaller(struct script_t*);
+size_t parseVar(char**, struct list_t*, size_t);
+
#endif