/* embed_private_string.c */
/* Guaranteed to allow up to 120 ASCII characters inside a function using gcc. */
/* It IS easily possible to get many, many more characters but this is a minimal approach. */
/* Without any modifications this will compile on these platforms:- */
/* Works on gcc 2.95.3 for the classic AMIGA OS 3.0.x using ADE the *NIX emulator, Motorola 68000+ architecture. */
/* Works on gcc 4.2.1 for OSX 10.14.x, 64 bit, Intel architecture. */
/* Works on gcc 7.3.0 for Linux Mint 19, 64 bit, Intel architecture. */
/* -- I have no idea whether this compiles on the current gcc 8.2.0, 20-02-2019. -- */

#include <stdio.h>

void Private_String(void)
{
    /* To keep this string near the top of the code this must be the first function. */
    /* This string will always be separate from the normal data section. */
    /* It MUST be an EVEN number of characters long, including a single */
    /* newline and the required NULL padding characters at the end. */
    asm("    jmp    exit_asm;"
    "string:"
    "    .asciz    \"'$VER (C)_Barry_Walker_CC0_Licence_[PD].'\\n\\0\";"
    "exit_asm:"
    "    nop;");
    /* IMPORTANT! DO NOT use the assembler RETURN instruction at all! */
    return;
}

/* All further strings will be stored in the data section area. */
void Test_Function(void)
{
    /* This function is just a test function. */
    printf("\nA test function to check that the strings are in the data section.\n"); 
    return;
}

int main(void)
{
    /* Note: Private_String() does absolutely NOTHING. */
    Private_String();
    Test_Function();
    printf("\nThese strings should be in the data section.\n");
    printf("The hidden string is inside the code section.\n");
    printf("'$VER (C)_Barry_Walker_CC0_Licence_[PD].'\n\n");
    return 0;
}

00000e00  55 48 89 e5 e9 2c 00 00  00 27 24 56 45 52 20 28  |UH...,...'$VER (|
00000e10  43 29 5f 42 61 72 72 79  5f 57 61 6c 6b 65 72 5f  |C)_Barry_Walker_|
00000e20  43 43 30 5f 4c 69 63 65  6e 63 65 5f 5b 50 44 5d  |CC0_Licence_[PD]|
00000e30  2e 27 0a 00 00 90 5d c3  0f 1f 84 00 00 00 00 00  |.'....].........|
00000e40  55 48 89 e5 48 83 ec 10  48 8d 3d 87 00 00 00 b0  |UH..H...H.=.....|
00000e50  00 e8 60 00 00 00 89 45  fc 48 83 c4 10 5d c3 90  |..`....E.H...]..|
00000e60  55 48 89 e5 48 83 ec 10  c7 45 fc 00 00 00 00 e8  |UH..H....E......|
00000e70  8c ff ff ff e8 c7 ff ff  ff 48 8d 3d 9b 00 00 00  |.........H.=....|
00000e80  b0 00 e8 2f 00 00 00 48  8d 3d bc 00 00 00 89 45  |.../...H.=.....E|
00000e90  f8 b0 00 e8 1e 00 00 00  48 8d 3d da 00 00 00 89  |........H.=.....|
00000ea0  45 f4 b0 00 e8 0d 00 00  00 31 c9 89 45 f0 89 c8  |E........1..E...|
00000eb0  48 83 c4 10 5d c3 ff 25  54 01 00 00 4c 8d 1d 45  |H...]..%T...L..E|
00000ec0  01 00 00 41 53 ff 25 35  01 00 00 90 68 00 00 00  |...AS.%5....h...|
00000ed0  00 e9 e6 ff ff ff 0a 41  20 74 65 73 74 20 66 75  |.......A test fu|
00000ee0  6e 63 74 69 6f 6e 20 74  6f 20 63 68 65 63 6b 20  |nction to check |
00000ef0  74 68 61 74 20 74 68 65  20 73 74 72 69 6e 67 73  |that the strings|
00000f00  20 61 72 65 20 69 6e 20  74 68 65 20 64 61 74 61  | are in the data|
00000f10  20 73 65 63 74 69 6f 6e  2e 0a 00 0a 54 68 65 73  | section....Thes|
00000f20  65 20 73 74 72 69 6e 67  73 20 73 68 6f 75 6c 64  |e strings should|
00000f30  20 62 65 20 69 6e 20 74  68 65 20 64 61 74 61 20  | be in the data |
00000f40  73 65 63 74 69 6f 6e 2e  0a 00 54 68 65 20 68 69  |section...The hi|
00000f50  64 64 65 6e 20 73 74 72  69 6e 67 20 69 73 20 69  |dden string is i|
00000f60  6e 73 69 64 65 20 74 68  65 20 63 6f 64 65 20 73  |nside the code s|
00000f70  65 63 74 69 6f 6e 2e 0a  00 27 24 56 45 52 20 28  |ection...'$VER (|