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Full Discussion: Unclear pointer and array
Top Forums Programming Unclear pointer and array Post 302884183 by Don Cragun on Saturday 18th of January 2014 07:32:50 AM
Old 01-18-2014
I repeat:
Quote:
because the sizeof(a) in:
Code:
       substring(start, end, text, a, sizeof(a)));

is the size of the pointer; not the number of bytes allocated by malloc() to the array pointed to by a.
And, since you're getting 8 bytes for sizeof(a), we know that you are building your application as a 64-bit app; not as a 32-bit app. You don't want sizeof(a) when a is a pointer; you need to use the number of bytes allocated to the space pointed to by that pointer instead.
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elf_fsize(3E)															     elf_fsize(3E)

NAME
elf32_fsize, elf64_fsize - return the size of an object file type for elf32 files, return the size of an object file type for elf64 files, respectively. SYNOPSIS
[flag... ] file... [library] ... DESCRIPTION
gives the size in bytes of the 32-bit file representation of count data objects with the given type. The library uses version ver to cal- culate the size (see elf(3E) and elf_version(3E)). Constant values are available for the sizes of fundamental types. Elf_Type File Size Memory Size ------------------------------------------------------ ELF_T_ADDR ELF32_FSZ_ADDR sizeof(Elf32_Addr) ELF_T_BYTE 1 sizeof(unsigned char) ELF_T_HALF ELF32_FSZ_HALF sizeof(Elf32_Half) ELT_T_OFF ELF32_FSZ_OFF sizeof(Elf32_Off) ELF_T_SWORD ELF32_FSZ_SWORD sizeof(Elf32_Sword) ELF_T_WORD ELF32_FSZ_WORD sizeof(Elf32_Word) returns zero if the value of type or ver is unknown. See elf_xlate(3E) for a list of the type values. gives the size in bytes of the 64-bit file representation of count data objects with the given type. The library uses version ver to cal- culate the size (see elf(3E) and elf_version(3E)). Constant values are available for the sizes of fundamental types. Elf_Type File Size Memory Size ------------------------------------------------------ ELF_T_ADDR ELF64_FSZ_ADDR sizeof(Elf64_Addr) ELF_T_BYTE 1 sizeof(unsigned char) ELF_T_HALF ELF64_FSZ_HALF sizeof(Elf64_Half) ELT_T_OFF ELF64_FSZ_OFF sizeof(Elf64_Off) ELF_T_SWORD ELF64_FSZ_SWORD sizeof(Elf64_Sword) ELF_T_WORD ELF64_FSZ_WORD sizeof(Elf64_Word) returns zero if the value of type or ver is unknown. See elf_xlate(3E) for a list of the type values. SEE ALSO
elf(3E), elf_version(3E), elf_xlate(3E). elf_fsize(3E)
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