8000 The very begining · postgrespro/libblobstamper@987cf19 · GitHub
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The very begining
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‎Makefile

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#DEPS = function.h
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#LIB_OBJS = function.o
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# https://stackoverflow.com/questions/18007326/how-to-change-default-values-of-variables-like-cc-in-makefile
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ifeq ($(origin CC),default)
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CC = gcc
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endif
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.PHONY: all
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all: test
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@echo All done!
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test: $(LIB_OBJS) test.o
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$(CC) $(LDFLAGS) $^ -o $@ $(LDLIBS)
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%.o: %.cpp $(DEPS)
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$(CC) $(CFLAGS) $<
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.PHONY: clean
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clean:
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rm -f *.o test
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@echo Clean done!

‎test.c

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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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typedef struct wflMemCtx
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{
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//Nothing for now;
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}wflMemCtx ;
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wflMemCtx static_ctx;
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wflMemCtx *
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wflCreateMemCtx()
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{
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return &static_ctx;
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}
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void
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wflDestroyMemCtx(wflMemCtx * mctx)
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{
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}
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typedef struct wflBlobDsc
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{
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struct wflMemCtx * mctx;
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char * data;
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int begin;
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int end;
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}wflBlobDsc;
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void
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wflBlobDump(wflBlobDsc* blob)
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{
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int length = blob->end - blob->begin + 1 ;
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char * str = malloc(length +1 ); // second +1 is for \0
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// FIXME проверка null
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str[0]='\0';
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strncat(str, blob->data + blob->begin, length); // second +1 is for \0
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printf("%s\n",str);
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free(str);
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}
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void*
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wflMalloc( size_t size )
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{
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/*just that simple for now*/
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return malloc( size );
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}
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wflBlobDsc*
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wflShiftN(wflBlobDsc* blob, size_t n)
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{
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wflBlobDsc* new_blob;
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// FIXME null check here;
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if (blob->begin + n > blob->end)
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return NULL; /*not enough data*/
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new_blob = wflMalloc(sizeof(wflBlobDsc));
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new_blob->data = blob->data;
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new_blob->begin = blob->begin;
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new_blob->end = blob->begin + n - 1;
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blob->begin += n;
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return new_blob;
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}
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char blob_data[]="aaalkjdhfs89345yu3ifhjew;lkhf4;lt;o34ithp;eriuwtgp;etup568p34tuewritwe;rtgj;ewoty;4w85tyeihwritgzzz";
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int main()
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{
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wflMemCtx * mctx;
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wflBlobDsc blob;
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wflBlobDsc * b2;
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mctx = wflCreateMemCtx();
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blob.mctx = mctx;
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blob.data = blob_data;
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blob.begin = 0;
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blob.end = strlen(blob_data)-1;
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wflBlobDump(&blob);
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printf("-----\n");
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b2 = wflShiftN(&blob,9993);
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wflBlobDump(&blob);
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wflBlobDump(b2);
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wflDestroyMemCtx(mctx);
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}

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