mirror of https://github.com/nothings/stb.git
29 lines
1.1 KiB
Plaintext
29 lines
1.1 KiB
Plaintext
// stretchy buffer // init: NULL // free: sbfree() // push_back: sbpush() // size: sbcount() //
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#define sbfree(a) ((a) ? free(stb__sbraw(a)),0 : 0)
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#define sbpush(a,v) (stb__sbmaybegrow(a,1), (a)[stb__sbn(a)++] = (v))
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#define sbcount(a) ((a) ? stb__sbn(a) : 0)
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#define sbadd(a,n) (stb__sbmaybegrow(a,n), stb__sbn(a)+=(n), &(a)[stb__sbn(a)-(n)])
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#define sblast(a) ((a)[stb__sbn(a)-1])
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#include <stdlib.h>
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#define stb__sbraw(a) ((int *) (a) - 2)
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#define stb__sbm(a) stb__sbraw(a)[0]
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#define stb__sbn(a) stb__sbraw(a)[1]
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#define stb__sbneedgrow(a,n) ((a)==0 || stb__sbn(a)+n >= stb__sbm(a))
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#define stb__sbmaybegrow(a,n) (stb__sbneedgrow(a,(n)) ? stb__sbgrow(a,n) : 0)
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#define stb__sbgrow(a,n) stb__sbgrowf((void **) &(a), (n), sizeof(*(a)))
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static void stb__sbgrowf(void **arr, int increment, int itemsize)
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{
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int m = *arr ? 2*stb__sbm(*arr)+increment : increment+1;
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void *p = realloc(*arr ? stb__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
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assert(p);
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if (p) {
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if (!*arr) ((int *) p)[1] = 0;
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*arr = (void *) ((int *) p + 2);
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stb__sbm(*arr) = m;
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}
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}
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