78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
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/* two template types: STRING(t) which defines a pascal-style string
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* of element (t) [STRING(char) is the closest to the pascal string],
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* and ANCHOR(t) which defines a baseplate that a linked list can be
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* built up from. [The linked list /must/ contain a ->next pointer
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* for linking the list together with.]
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*/
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#ifndef _CSTRING_D
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#define _CSTRING_D
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#include <string.h>
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#include <stdlib.h>
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#ifndef __WITHOUT_AMALLOC
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# include "amalloc.h"
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#endif
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/* expandable Pascal-style string.
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*/
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#define STRING(type) struct { type *text; int size, alloc; }
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#define CREATE(x) ( (T(x) = (void*)0), (S(x) = (x).alloc = 0) )
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#define EXPAND(x) (S(x)++)[(S(x) < (x).alloc) \
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? (T(x)) \
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: (T(x) = T(x) ? realloc(T(x), sizeof T(x)[0] * ((x).alloc += 100)) \
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: malloc(sizeof T(x)[0] * ((x).alloc += 100)) )]
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#define DELETE(x) ALLOCATED(x) ? (free(T(x)), S(x) = (x).alloc = 0) \
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: ( S(x) = 0 )
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#define CLIP(t,i,sz) \
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S(t) -= ( ((i) >= 0) && ((sz) > 0) && (((i)+(sz)) <= S(t)) ) ? \
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(memmove(&T(t)[i], &T(t)[i+sz], (S(t)-(i+sz)+1)*sizeof(T(t)[0])), \
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(sz)) : 0
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#define RESERVE(x, sz) T(x) = ((x).alloc > S(x) + (sz) \
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? T(x) \
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: T(x) \
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? realloc(T(x), sizeof T(x)[0] * ((x).alloc = 100+(sz)+S(x))) \
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: malloc(sizeof T(x)[0] * ((x).alloc = 100+(sz)+S(x))))
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#define SUFFIX(t,p,sz) \
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memcpy(((S(t) += (sz)) - (sz)) + \
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(T(t) = T(t) ? realloc(T(t), sizeof T(t)[0] * ((t).alloc += sz)) \
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: malloc(sizeof T(t)[0] * ((t).alloc += sz))), \
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(p), sizeof(T(t)[0])*(sz))
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#define PREFIX(t,p,sz) \
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RESERVE( (t), (sz) ); \
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if ( S(t) ) { memmove(T(t)+(sz), T(t), S(t)); } \
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memcpy( T(t), (p), (sz) ); \
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S(t) += (sz)
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/* reference-style links (and images) are stored in an array
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*/
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#define T(x) (x).text
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#define S(x) (x).size
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#define ALLOCATED(x) (x).alloc
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/* abstract anchor type that defines a list base
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* with a function that attaches an element to
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* the end of the list.
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*
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* the list base field is named .text so that the T()
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* macro will work with it.
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*/
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#define ANCHOR(t) struct { t *text, *end; }
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#define E(t) ((t).end)
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#define ATTACH(t, p) ( T(t) ? ( (E(t)->next = (p)), (E(t) = (p)) ) \
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: ( (T(t) = E(t) = (p)) ) )
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typedef STRING(char) Cstring;
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extern void Csputc(int, Cstring *);
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extern int Csprintf(Cstring *, char *, ...);
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extern int Cswrite(Cstring *, char *, int);
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extern void Csreparse(Cstring *, char *, int, int);
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#endif/*_CSTRING_D*/
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