cregit-Linux how code gets into the kernel

Release 4.15 scripts/conmakehash.c

Directory: scripts
/*
 * conmakehash.c
 *
 * Create arrays for initializing the kernel folded tables (using a hash
 * table turned out to be to limiting...)  Unfortunately we can't simply
 * preinitialize the tables at compile time since kfree() cannot accept
 * memory not allocated by kmalloc(), and doing our own memory management
 * just for this seems like massive overkill.
 *
 * Copyright (C) 1995-1997 H. Peter Anvin
 *
 * This program is a part of the Linux kernel, and may be freely
 * copied under the terms of the GNU General Public License (GPL),
 * version 2, or at your option any later version.
 */

#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <string.h>
#include <ctype.h>


#define MAX_FONTLEN 256


typedef unsigned short unicode;


static void usage(char *argv0) { fprintf(stderr, "Usage: \n" " %s chartable [hashsize] [hashstep] [maxhashlevel]\n", argv0); exit(EX_USAGE); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2496.00%150.00%
Trevor Keith14.00%150.00%
Total25100.00%2100.00%


static int getunicode(char **p0) { char *p = *p0; while (*p == ' ' || *p == '\t') p++; if (*p != 'U' || p[1] != '+' || !isxdigit(p[2]) || !isxdigit(p[3]) || !isxdigit(p[4]) || !isxdigit(p[5]) || isxdigit(p[6])) return -1; *p0 = p+6; return strtol(p+2,0,16); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)11399.12%150.00%
Trevor Keith10.88%150.00%
Total114100.00%2100.00%

unicode unitable[MAX_FONTLEN][255]; /* Massive overkill, but who cares? */ int unicount[MAX_FONTLEN];
static void addpair(int fp, int un) { int i; if ( un <= 0xfffe ) { /* Check it isn't a duplicate */ for ( i = 0 ; i < unicount[fp] ; i++ ) if ( unitable[fp][i] == un ) return; /* Add to list */ if ( unicount[fp] > 254 ) { fprintf(stderr, "ERROR: Only 255 unicodes/glyph permitted!\n"); exit(EX_DATAERR); } unitable[fp][unicount[fp]] = un; unicount[fp]++; } /* otherwise: ignore */ }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)9698.97%266.67%
Trevor Keith11.03%133.33%
Total97100.00%3100.00%


int main(int argc, char *argv[]) { FILE *ctbl; char *tblname; char buffer[65536]; int fontlen; int i, nuni, nent; int fp0, fp1, un0, un1; char *p, *p1; if ( argc < 2 || argc > 5 ) usage(argv[0]); if ( !strcmp(argv[1],"-") ) { ctbl = stdin; tblname = "stdin"; } else { ctbl = fopen(tblname = argv[1], "r"); if ( !ctbl ) { perror(tblname); exit(EX_NOINPUT); } } /* For now we assume the default font is always 256 characters. */ fontlen = 256; /* Initialize table */ for ( i = 0 ; i < fontlen ; i++ ) unicount[i] = 0; /* Now we come to the tricky part. Parse the input table. */ while ( fgets(buffer, sizeof(buffer), ctbl) != NULL ) { if ( (p = strchr(buffer, '\n')) != NULL ) *p = '\0'; else fprintf(stderr, "%s: Warning: line too long\n", tblname); p = buffer; /* * Syntax accepted: * <fontpos> <unicode> <unicode> ... * <range> idem * <range> <unicode range> * * where <range> ::= <fontpos>-<fontpos> * and <unicode> ::= U+<h><h><h><h> * and <h> ::= <hexadecimal digit> */ while (*p == ' ' || *p == '\t') p++; if (!*p || *p == '#') continue; /* skip comment or blank line */ fp0 = strtol(p, &p1, 0); if (p1 == p) { fprintf(stderr, "Bad input line: %s\n", buffer); exit(EX_DATAERR); } p = p1; while (*p == ' ' || *p == '\t') p++; if (*p == '-') { p++; fp1 = strtol(p, &p1, 0); if (p1 == p) { fprintf(stderr, "Bad input line: %s\n", buffer); exit(EX_DATAERR); } p = p1; } else fp1 = 0; if ( fp0 < 0 || fp0 >= fontlen ) { fprintf(stderr, "%s: Glyph number (0x%x) larger than font length\n", tblname, fp0); exit(EX_DATAERR); } if ( fp1 && (fp1 < fp0 || fp1 >= fontlen) ) { fprintf(stderr, "%s: Bad end of range (0x%x)\n", tblname, fp1); exit(EX_DATAERR); } if (fp1) { /* we have a range; expect the word "idem" or a Unicode range of the same length */ while (*p == ' ' || *p == '\t') p++; if (!strncmp(p, "idem", 4)) { for (i=fp0; i<=fp1; i++) addpair(i,i); p += 4; } else { un0 = getunicode(&p); while (*p == ' ' || *p == '\t') p++; if (*p != '-') { fprintf(stderr, "%s: Corresponding to a range of font positions, there should be a Unicode range\n", tblname); exit(EX_DATAERR); } p++; un1 = getunicode(&p); if (un0 < 0 || un1 < 0) { fprintf(stderr, "%s: Bad Unicode range corresponding to font position range 0x%x-0x%x\n", tblname, fp0, fp1); exit(EX_DATAERR); } if (un1 - un0 != fp1 - fp0) { fprintf(stderr, "%s: Unicode range U+%x-U+%x not of the same length as font position range 0x%x-0x%x\n", tblname, un0, un1, fp0, fp1); exit(EX_DATAERR); } for(i=fp0; i<=fp1; i++) addpair(i,un0-fp0+i); } } else { /* no range; expect a list of unicode values for a single font position */ while ( (un0 = getunicode(&p)) >= 0 ) addpair(fp0, un0); } while (*p == ' ' || *p == '\t') p++; if (*p && *p != '#') fprintf(stderr, "%s: trailing junk (%s) ignored\n", tblname, p); } /* Okay, we hit EOF, now output hash table */ fclose(ctbl); /* Compute total size of Unicode list */ nuni = 0; for ( i = 0 ; i < fontlen ; i++ ) nuni += unicount[i]; printf("\ /*\n\ * Do not edit this file; it was automatically generated by\n\ *\n\ * conmakehash %s > [this file]\n\ *\n\ */\n\ \n\ #include <linux/types.h>\n\ \n\ u8 dfont_unicount[%d] = \n\ {\n\t", argv[1], fontlen); for ( i = 0 ; i < fontlen ; i++ ) { printf("%3d", unicount[i]); if ( i == fontlen-1 ) printf("\n};\n"); else if ( i % 8 == 7 ) printf(",\n\t"); else printf(", "); } printf("\nu16 dfont_unitable[%d] = \n{\n\t", nuni); fp0 = 0; nent = 0; for ( i = 0 ; i < nuni ; i++ ) { while ( nent >= unicount[fp0] ) { fp0++; nent = 0; } printf("0x%04x", unitable[fp0][nent++]); if ( i == nuni-1 ) printf("\n};\n"); else if ( i % 8 == 7 ) printf(",\n\t"); else printf(", "); } exit(EX_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)874100.00%4100.00%
Total874100.00%4100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)114899.74%480.00%
Trevor Keith30.26%120.00%
Total1151100.00%5100.00%
Directory: scripts
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