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1 | /* |
2 | * malloc.h: safe wrappers around malloc, realloc, free, strdup |
3 | */ |
4 | |
5 | #ifndef AGEDU_MALLOC_H |
6 | #define AGEDU_MALLOC_H |
7 | |
8 | #include <stddef.h> |
9 | |
10 | /* |
11 | * smalloc should guarantee to return a useful pointer. |
12 | */ |
13 | void *smalloc(size_t size); |
14 | |
15 | /* |
16 | * srealloc should guaranteeably be able to realloc NULL |
17 | */ |
18 | void *srealloc(void *p, size_t size); |
19 | |
20 | /* |
21 | * sfree should guaranteeably deal gracefully with freeing NULL |
22 | */ |
23 | void sfree(void *p); |
24 | |
25 | /* |
26 | * dupstr is like strdup, but with the never-return-NULL property |
27 | * of smalloc (and also reliably defined in all environments :-) |
28 | */ |
29 | char *dupstr(const char *s); |
30 | |
31 | /* |
32 | * dupfmt is a bit like printf, but does its own allocation and |
33 | * returns a dynamic string. It also supports a different (and |
34 | * much less featureful) set of format directives: |
35 | * |
36 | * - %D takes no argument, and gives the current date and time in |
37 | * a format suitable for an HTTP Date header |
38 | * - %d takes an int argument and formats it like normal %d (but |
39 | * doesn't support any of the configurability of standard |
40 | * printf) |
41 | * - %s takes a const char * and formats it like normal %s |
42 | * (again, no fine-tuning available) |
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43 | * - %h takes a const char * but escapes it so that it's safe for |
44 | * HTML |
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45 | * - %S takes an int followed by a const char *. If the int is |
46 | * zero, it behaves just like %s. If the int is nonzero, it |
47 | * transforms the string by stuffing a \r before every \n. |
48 | */ |
49 | char *dupfmt(const char *fmt, ...); |
50 | |
51 | /* |
52 | * snew allocates one instance of a given type, and casts the |
53 | * result so as to type-check that you're assigning it to the |
54 | * right kind of pointer. Protects against allocation bugs |
55 | * involving allocating the wrong size of thing. |
56 | */ |
57 | #define snew(type) \ |
58 | ( (type *) smalloc (sizeof (type)) ) |
59 | |
60 | /* |
61 | * snewn allocates n instances of a given type, for arrays. |
62 | */ |
63 | #define snewn(number, type) \ |
64 | ( (type *) smalloc ((number) * sizeof (type)) ) |
65 | |
66 | /* |
67 | * sresize wraps realloc so that you specify the new number of |
68 | * elements and the type of the element, with the same type- |
69 | * checking advantages. Also type-checks the input pointer. |
70 | */ |
71 | #define sresize(array, number, type) \ |
72 | ( (void)sizeof((array)-(type *)0), \ |
73 | (type *) srealloc ((array), (number) * sizeof (type)) ) |
74 | |
75 | #endif /* AGEDU_MALLOC_H */ |