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    <p>C compilers are capable of doing math. No regular expressions or file modifications needed.</p> <p>file.h:</p> <pre><code>/* Definitions for peripherals */ #define XPAR_NF10_ROUTER_OUTPUT_PORT_LOOKUP_0_BAR0_BASEADDR 0x76800000 #define XPAR_NF10_ROUTER_OUTPUT_PORT_LOOKUP_0_BAR0_HIGHADDR 0x7680FFFF //Shorten name to make it easier for asker to read #define BASEADDR XPAR_NF10_ROUTER_OUTPUT_PORT_LOOKUP_0_BAR0_BASEADDR #define XPAR_NF10_ROUTER_OUTPUT_PORT_LOOKUP_0_BAR0_RESET_CNTRS_OFFSET (BASEADDR + 0x0) #define XPAR_NF10_ROUTER_OUTPUT_PORT_LOOKUP_0_BAR0_MAC_1_LOW_OFFSET (BASEADDR + 0xc) #define XPAR_NF10_ROUTER_OUTPUT_PORT_LOOKUP_0_BAR0_MAC_1_HIGH_OFFSET (BASEADDR + 0x10) #define XPAR_NF10_ROUTER_OUTPUT_PORT_LOOKUP_0_BAR0_MAC_3_LOW_OFFSET (BASEADDR + 0x1c) #define XPAR_NF10_ROUTER_OUTPUT_PORT_LOOKUP_0_BAR0_MAC_3_HIGH_OFFSET (BASEADDR + 0x20) #undef BASEADDR </code></pre> <p>And a pseudocode script (with real regexes) to do the transformation you want, if you don't like this solution:</p> <pre><code>#This script assumes that OFFSET #defines come after # their associated BASEADDR #defines input_file = open("path/to/input/file.c", read) output_file = open("path/to/output/file.c", write) baseaddr = 0 #In iteration of the loop, "line" will be a string # containing a single line of the file foreach line in input_file: #Get base address from the _BASEADDR #defines if regex_match("#define .*_BASEADDR (0x[0-9]{8})", line): baseaddr = hex_string_to_number(regex_groups[0]) write_line(output_file, line) #Create new offset #define by adding offset from source # file to base address from source file else if regex_match("#define (.*)_OFFSET (0x[0-9]+)", line): new_val = hex_string_to_number(regex_groups[1]) + baseaddr #Format here is similar to C's sprintf. # Whichever language you choose will likely have # something that behaves differently new_line = format("#define %s_OFFSET %s", regex_groups[0], number_to_hex_string(new_val)) write_line(output_file, new_line) #Pass through all other lines (blanks, HIGHADDRs, comments, etc) else: write_line(output_file, line) </code></pre>
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    1. USEric Finn
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    1. POParsing a file and making modification using regex
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    1. COThe input.c is generated by a tool, i don't want to manually edit the file. So would prefer a script that can actually do it. Do you have any idea on how to do it using scripts.
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    2. CODo you have control over the tool? If so, I'd modify the tool. I'll modify my answer to add a script with regular expressions to do what you want, and comment again once you're done with that.
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    3. COThanks for that. Script would be really great, i look forward to it. The tool doesn't allow me to modify that, the tool inherently prints the results like this. Moreover, input.c is just a small sample the actual file runs very long.
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