/ ************************************************************************ * * Purpose: To display a file in (mainframe) dump format as shown below. * * 20 2A 20 68 65 78 5F 63 68 61 72 28 63 68 61 72 * hex_char(char * 20 2A 70 6F 73 69 74 69 6F 6E 2C 20 63 68 61 72 *position, char * 20 63 29 0A 20 20 20 7B 0A 20 20 20 73 70 72 69 c). {. spri * 6E 74 66 28 70 6F 73 69 74 69 6F 6E 2C 20 22 25 ntf(position, "% * 30 32 58 20 22 2C 20 63 29 3B 20 0A 0A 09 09 09 02X ", c); ..... * * Syntax: hexdump filename * * Method: The program fills a variable (line) with the data, when * the variable is full - it is sent to STDOUT. * Unprintable charcters are converted to '.' in the ASCII * display on the right. * * Bugs: If the last line of the dump is full, the program will * follow it with a blank line. Not exactly a serious bug * but you are welcome to fix it. * * To do: o Highlight '0A' (end of line) - seems like a good idea. * o Get it to read directories. * o Remove the directory info from argv[0] (if present). * o Add a column showing the byte offset. * * Author: M J Leslie * * Rev Date Comments * --- --------- -------- * 1.0 08-Feb-94 Inital Release. * * 1.1 12-May-95 Original only worked for the hex range 00-7F * This version supports 00-FF. * Thanks to Emmanuel Guyot for the fix. * ************************************************************************/ #include <stdio.h> #define HEX_OFFSET 1 #define ASCII_OFFSET 51 #define NUM_CHARS 16 /************************************************************************/ void hexdump (char* prog_name, char * filename); /* Clear the display line. */ void clear_line (char *line, int size); /* Put a character (in hex format * into the display line. */ char * hex_char (char *position, int c); /* Put a character (in ASCII format * into the display line. */ char * ascii_char (char *position, int c); /************************************************************************/ main(int argc, char * argv[]) { char *prog_name="hexdump"; if (argc != 2) { printf("\n\t%s syntax:\n\n", argv[0]); printf("\t\t%s filename\n\n", argv[0]); exit(0); } hexdump( argv[0], argv[1]); } /************************************************************************ * * The program proper. * ************************************************************************/ void hexdump(char* prog_name, char * filename) { int c=' '; /* Character read from the file */ char * hex_offset; /* Position of the next character * in Hex */ char * ascii_offset; /* Position of the next character * in ASCII. */ FILE *ptr; /* Pointer to the file. */ char line[81]; /* O/P line. */ /* Open the file */ ptr = fopen(filename,"r"); if ( ferror(ptr) ) { printf("\n\t%s: Unable to open %s\n\n", prog_name, filename); exit(0); } /* little heading. */ printf("\n\tHex dump of %s\n\n", filename); /* Read one character at a time, * checking for the End of File. * EOF is defined in <stdio.h> */ while (c != EOF ) { /* Prepare the variables. */ clear_line(line, sizeof line); hex_offset = line+HEX_OFFSET; ascii_offset = line+ASCII_OFFSET; while ( ascii_offset < line+ASCII_OFFSET+NUM_CHARS &&(c = fgetc(ptr)) != EOF ) { /* Build the hex part of * the line. */ hex_offset = hex_char(hex_offset, c); /* Build the Ascii part of * the line. */ ascii_offset = ascii_char(ascii_offset, c); } /* Display the current line */ printf("%s\n", line); } fclose(ptr); /* Close the file. */ } /************************************************************************ * * Clear the display line. * ************************************************************************/ void clear_line(char *line, int size) { int count; for (count=0; count < size; line[count]=' ', count++); } /************************************************************************ * * Put a character into the display line and return the location * of the next character. * ************************************************************************/ char * ascii_char(char *position, int c) { /* If the character is NOT printable * replace it with a '.' */ if (!isprint(c)) c='.'; sprintf(position, "%c", c); /* Put the character to the line * so it can be displayed later */ /* Return the position of the next * ASCII character. */ return(++position); } /************************************************************************ * * Put the hex value of a character into the display line and * return the location of the next hex character. * ************************************************************************/ char * hex_char(char *position, int c) { int offset=3; /* Format and place the character into * the display line. * (unsigned char) required for correct * O/P. */ sprintf(position, "%02X ", (unsigned char) c); *(position+offset)=' '; /* Remove the '/0' created by 'sprint' */ return (position+offset); }
file: /Techref/language/ccpp/Cref/PROBLEMS/hexdump1.c, 5KB, , updated: 1997/4/21 09:53, local time: 2024/8/23 05:43,
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