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Diffstat (limited to 'bin/dash/src/mkinit.c')
| -rw-r--r-- | bin/dash/src/mkinit.c | 493 |
1 files changed, 493 insertions, 0 deletions
diff --git a/bin/dash/src/mkinit.c b/bin/dash/src/mkinit.c new file mode 100644 index 00000000..9025862e --- /dev/null +++ b/bin/dash/src/mkinit.c @@ -0,0 +1,493 @@ +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1997-2005 + * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * This program scans all the source files for code to handle various + * special events and combines this code into one file. This (allegedly) + * improves the structure of the program since there is no need for + * anyone outside of a module to know that that module performs special + * operations on particular events. + * + * Usage: mkinit sourcefile... + */ + + +#include <sys/types.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <unistd.h> + + +/* + * OUTFILE is the name of the output file. Output is initially written + * to the file OUTTEMP, which is then moved to OUTFILE. + */ + +#define OUTFILE "init.c" +#define OUTTEMP "init.c.new" + + +/* + * A text structure is basicly just a string that grows as more characters + * are added onto the end of it. It is implemented as a linked list of + * blocks of characters. The routines addstr and addchar append a string + * or a single character, respectively, to a text structure. Writetext + * writes the contents of a text structure to a file. + */ + +#define BLOCKSIZE 512 + +struct text { + char *nextc; + int nleft; + struct block *start; + struct block *last; +}; + +struct block { + struct block *next; + char text[BLOCKSIZE]; +}; + + +/* + * There is one event structure for each event that mkinit handles. + */ + +struct event { + char *name; /* name of event (e.g. INIT) */ + char *routine; /* name of routine called on event */ + char *comment; /* comment describing routine */ + struct text code; /* code for handling event */ +}; + + +char writer[] = "\ +/*\n\ + * This file was generated by the mkinit program.\n\ + */\n\ +\n"; + +char init[] = "\ +/*\n\ + * Initialization code.\n\ + */\n"; + +char exitreset[] = "\ +/*\n\ + * This routine is called when an error or an interrupt occurs in an\n\ + * interactive shell and control is returned to the main command loop\n\ + * but prior to exitshell. \n\ + */\n"; + +char forkreset[] = "\ +/*\n\ + * This routine is called when we enter a subshell.\n\ + */\n"; + +char reset[] = "\ +/*\n\ + * This routine is called when an error or an interrupt occurs in an\n\ + * interactive shell and control is returned to the main command loop.\n\ + */\n"; + + +struct event event[] = { + {"INIT", "init", init}, + {"EXITRESET", "exitreset", exitreset}, + {"FORKRESET", "forkreset", forkreset}, + {"RESET", "reset", reset}, + {NULL, NULL} +}; + + +char *curfile; /* current file */ +int linno; /* current line */ +char *header_files[200]; /* list of header files */ +struct text defines; /* #define statements */ +struct text decls; /* declarations */ +int amiddecls; /* for formatting */ + + +void readfile(char *); +int match(char *, char *); +int gooddefine(char *); +void doevent(struct event *, FILE *, char *); +void doinclude(char *); +void dodecl(char *, FILE *); +void output(void); +void addstr(char *, struct text *); +void addchar(int, struct text *); +void writetext(struct text *, FILE *); +FILE *ckfopen(char *, char *); +void *ckmalloc(int); +char *savestr(char *); +static void error(char *); +int main(int, char **); + +#define equal(s1, s2) (strcmp(s1, s2) == 0) + +int +main(int argc, char **argv) +{ + char **ap; + + header_files[0] = "\"shell.h\""; + header_files[1] = "\"mystring.h\""; + header_files[2] = "\"init.h\""; + for (ap = argv + 1 ; *ap ; ap++) + readfile(*ap); + output(); + rename(OUTTEMP, OUTFILE); + exit(0); + /* NOTREACHED */ +} + + +/* + * Parse an input file. + */ + +void +readfile(char *fname) +{ + FILE *fp; + char line[1024]; + struct event *ep; + + fp = ckfopen(fname, "r"); + curfile = fname; + linno = 0; + amiddecls = 0; + while (fgets(line, sizeof line, fp) != NULL) { + linno++; + for (ep = event ; ep->name ; ep++) { + if (line[0] == ep->name[0] && match(ep->name, line)) { + doevent(ep, fp, fname); + break; + } + } + if (line[0] == 'I' && match("INCLUDE", line)) + doinclude(line); + if (line[0] == 'M' && match("MKINIT", line)) + dodecl(line, fp); + if (line[0] == '#' && gooddefine(line)) { + char *cp; + char line2[1024]; + static const char undef[] = "#undef "; + + strcpy(line2, line); + memcpy(line2, undef, sizeof(undef) - 1); + cp = line2 + sizeof(undef) - 1; + while(*cp && (*cp == ' ' || *cp == '\t')) + cp++; + while(*cp && *cp != ' ' && *cp != '\t' && *cp != '\n') + cp++; + *cp++ = '\n'; *cp = '\0'; + addstr(line2, &defines); + addstr(line, &defines); + } + } + fclose(fp); +} + + +int +match(char *name, char *line) +{ + char *p, *q; + + p = name, q = line; + while (*p) { + if (*p++ != *q++) + return 0; + } + if (*q != '{' && *q != ' ' && *q != '\t' && *q != '\n') + return 0; + return 1; +} + + +int +gooddefine(char *line) +{ + char *p; + + if (! match("#define", line)) + return 0; /* not a define */ + p = line + 7; + while (*p == ' ' || *p == '\t') + p++; + while (*p != ' ' && *p != '\t') { + if (*p == '(') + return 0; /* macro definition */ + p++; + } + while (*p != '\n' && *p != '\0') + p++; + if (p[-1] == '\\') + return 0; /* multi-line definition */ + return 1; +} + + +void +doevent(struct event *ep, FILE *fp, char *fname) +{ + char line[1024]; + int indent; + char *p; + + sprintf(line, "\n /* from %s: */\n", fname); + addstr(line, &ep->code); + addstr(" {\n", &ep->code); + for (;;) { + linno++; + if (fgets(line, sizeof line, fp) == NULL) + error("Unexpected EOF"); + if (equal(line, "}\n")) + break; + indent = 6; + for (p = line ; *p == '\t' ; p++) + indent += 8; + for ( ; *p == ' ' ; p++) + indent++; + if (*p == '\n' || *p == '#') + indent = 0; + while (indent >= 8) { + addchar('\t', &ep->code); + indent -= 8; + } + while (indent > 0) { + addchar(' ', &ep->code); + indent--; + } + addstr(p, &ep->code); + } + addstr(" }\n", &ep->code); +} + + +void +doinclude(char *line) +{ + char *p; + char *name; + char **pp; + + for (p = line ; *p != '"' && *p != '<' && *p != '\0' ; p++); + if (*p == '\0') + error("Expecting '\"' or '<'"); + name = p; + while (*p != ' ' && *p != '\t' && *p != '\n') + p++; + if (p[-1] != '"' && p[-1] != '>') + error("Missing terminator"); + *p = '\0'; + + /* name now contains the name of the include file */ + for (pp = header_files ; *pp && ! equal(*pp, name) ; pp++); + if (*pp == NULL) + *pp = savestr(name); +} + + +void +dodecl(char *line1, FILE *fp) +{ + char line[1024]; + char *p, *q; + + if (strcmp(line1, "MKINIT\n") == 0) { /* start of struct/union decl */ + addchar('\n', &decls); + do { + linno++; + if (fgets(line, sizeof line, fp) == NULL) + error("Unterminated structure declaration"); + addstr(line, &decls); + } while (line[0] != '}'); + amiddecls = 0; + } else { + if (! amiddecls) + addchar('\n', &decls); + q = NULL; + for (p = line1 + 6 ; *p && strchr("=/\n", *p) == NULL; p++) + continue; + if (*p == '=') { /* eliminate initialization */ + for (q = p ; *q && *q != ';' ; q++); + if (*q == '\0') + q = NULL; + else { + while (p[-1] == ' ') + p--; + *p = '\0'; + } + } + addstr("extern", &decls); + addstr(line1 + 6, &decls); + if (q != NULL) + addstr(q, &decls); + amiddecls = 1; + } +} + + + +/* + * Write the output to the file OUTTEMP. + */ + +void +output(void) +{ + FILE *fp; + char **pp; + struct event *ep; + + fp = ckfopen(OUTTEMP, "w"); + fputs(writer, fp); + for (pp = header_files ; *pp ; pp++) + fprintf(fp, "#include %s\n", *pp); + fputs("\n\n\n", fp); + writetext(&defines, fp); + fputs("\n\n", fp); + writetext(&decls, fp); + for (ep = event ; ep->name ; ep++) { + fputs("\n\n\n", fp); + fputs(ep->comment, fp); + fprintf(fp, "\nvoid\n%s() {\n", ep->routine); + writetext(&ep->code, fp); + fprintf(fp, "}\n"); + } + fclose(fp); +} + + +/* + * A text structure is simply a block of text that is kept in memory. + * Addstr appends a string to the text struct, and addchar appends a single + * character. + */ + +void +addstr(char *s, struct text *text) +{ + while (*s) { + if (--text->nleft < 0) + addchar(*s++, text); + else + *text->nextc++ = *s++; + } +} + + +void +addchar(int c, struct text *text) +{ + struct block *bp; + + if (--text->nleft < 0) { + bp = ckmalloc(sizeof *bp); + if (text->start == NULL) + text->start = bp; + else + text->last->next = bp; + text->last = bp; + text->nextc = bp->text; + text->nleft = BLOCKSIZE - 1; + } + *text->nextc++ = c; +} + +/* + * Write the contents of a text structure to a file. + */ +void +writetext(struct text *text, FILE *fp) +{ + struct block *bp; + + if (text->start != NULL) { + for (bp = text->start ; bp != text->last ; bp = bp->next) { + if ((fwrite(bp->text, sizeof (char), BLOCKSIZE, fp)) != BLOCKSIZE) + error("Can't write data\n"); + } + if ((fwrite(bp->text, sizeof (char), BLOCKSIZE - text->nleft, fp)) != (BLOCKSIZE - text->nleft)) + error("Can't write data\n"); + } +} + +FILE * +ckfopen(char *file, char *mode) +{ + FILE *fp; + + if ((fp = fopen(file, mode)) == NULL) { + fprintf(stderr, "Can't open %s\n", file); + exit(2); + } + return fp; +} + +void * +ckmalloc(int nbytes) +{ + char *p; + + if ((p = malloc(nbytes)) == NULL) + error("Out of space"); + return p; +} + +char * +savestr(char *s) +{ + char *p; + + p = ckmalloc(strlen(s) + 1); + strcpy(p, s); + return p; +} + +static void +error(char *msg) +{ + if (curfile != NULL) + fprintf(stderr, "%s:%d: ", curfile, linno); + fprintf(stderr, "%s\n", msg); + exit(2); + /* NOTREACHED */ +} |