├── LICENSE
├── README.md
├── c2nasm.sh
└── test
    ├── exec_test.sh
    └── hello.c


/LICENSE:
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 1 | This is free and unencumbered software released into the public domain.
 2 | 
 3 | Anyone is free to copy, modify, publish, use, compile, sell, or
 4 | distribute this software, either in source code form or as a compiled
 5 | binary, for any purpose, commercial or non-commercial, and by any
 6 | means.
 7 | 
 8 | In jurisdictions that recognize copyright laws, the author or authors
 9 | of this software dedicate any and all copyright interest in the
10 | software to the public domain. We make this dedication for the benefit
11 | of the public at large and to the detriment of our heirs and
12 | successors. We intend this dedication to be an overt act of
13 | relinquishment in perpetuity of all present and future rights to this
14 | software under copyright law.
15 | 
16 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
19 | IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 | OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 | ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 | OTHER DEALINGS IN THE SOFTWARE.
23 | 
24 | For more information, please refer to <http://unlicense.org>
25 | 


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/README.md:
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 1 | 
 2 | # C2NASM
 3 | 
 4 | Uses gcc and objconv to convert a C program to nasm.
 5 | 
 6 | To use it, give execution permission to c2nasm.sh and then:
 7 | 
 8 | ```
 9 | ./c2nasm.sh <sourcefile.c>
10 | ```
11 | 
12 | The result will be a .nasm file with the nasm, and a .run file which is the executable.
13 | 
14 | Note that you might get a better nasm output by tunning the optimization parameter in gcc (`-O0` for no optimization, `-O3` to optimize as much as possible).
15 | 
16 | 
17 | 
18 | Based on the question:
19 | http://stackoverflow.com/questions/20737947/how-to-generate-a-nasm-compilable-assembly-code-from-c-source-code-on-linux/
20 | 


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/c2nasm.sh:
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 1 | #!/bin/sh
 2 | set -e
 3 | help(){
 4 |   echo "$1: Uses gcc and objconv to convert a C program to nasm"
 5 |   echo "usage: $1 <sourcefile.c>"
 6 |   exit 0
 7 | }
 8 | [ -z "$1" ] || [ "$1" == "-h" ] && help "$(basename "$0")"
 9 | 
10 | C_FILE="$1"
11 | O_FILE="$C_FILE.o"
12 | NASM_FILE="$C_FILE.nasm"
13 | NASM_O_FILE="$NASM_FILE.o"
14 | EXEC_FILE="$C_FILE.run"
15 | gcc -m32 -c -o "$O_FILE" "$C_FILE"
16 | objconv -fnasm "$O_FILE" "$NASM_FILE"
17 | sed -i 's|st(0)|st0  |g' "$NASM_FILE"
18 | sed -i 's|noexecute|         |g' "$NASM_FILE"
19 | sed -i 's|execute|       |g' "$NASM_FILE"
20 | sed -i 's|: function||g' "$NASM_FILE"
21 | sed -i 's|?_|L_|g' "$NASM_FILE"
22 | sed -i -n '/SECTION .eh_frame/q;p' "$NASM_FILE"
23 | sed -i 's|;.*||g' "$NASM_FILE"
24 | sed -i 's/^M//g' "$NASM_FILE"
25 | sed -i 's|\s\+$||g' "$NASM_FILE"
26 | sed -i 's|align=1||g' "$NASM_FILE"
27 | echo 'Nasm file generated in '"$NASM_FILE"
28 | nasm -f elf32 -o "$NASM_O_FILE" "$NASM_FILE"
29 | gcc -m32 -lGL -lm -o "$EXEC_FILE"  "$NASM_O_FILE"
30 | echo 'Successfully compiled '"$NASM_FILE" to "$EXEC_FILE"
31 | 
32 | 


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/test/exec_test.sh:
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 1 | #!/bin/sh
 2 | 
 3 | 
 4 | test_clean(){
 5 |   rm -f hello.c.nasm
 6 |   rm -f hello.c.nasm.o  
 7 |   rm -f hello.c.o  
 8 |   rm -f hello.c.run
 9 | }
10 | 
11 | assert_exists(){
12 |   [ -f "$1" ] || {
13 |     echo "Test Failed: File $1 should exist"
14 |     exit
15 |   }
16 | }
17 | assert_return(){
18 |   "$1"
19 |   ret="$?"
20 |   [ "$ret" == "$2" ] || {
21 |     echo "Test Failed: Return of $1 should be $2, instead I got $ret "
22 |     exit
23 |   }
24 | }
25 | test_clean
26 | 
27 | ../c2nasm.sh hello.c
28 | assert_exists hello.c.nasm
29 | assert_exists hello.c.nasm.o  
30 | assert_exists hello.c.o  
31 | assert_exists hello.c.run
32 | assert_return ./hello.c.run 6
33 | 
34 | echo "=================="
35 | echo All tests passed
36 | echo "=================="
37 | 
38 | 


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/test/hello.c:
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 1 | 
 2 | int main(){
 3 |   char a =1;
 4 |   char b =2;
 5 |   a = b + a;
 6 |   a *= 2;
 7 |   return a;
 8 | }
 9 | 
10 | 
11 | 
12 | 
13 | 
14 | 
15 | 
16 | 


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