4.3BSD - /usr/src/new/spms/src/lib/pgrep/readmf.c

   1: /* $Header$ */
   2: 
   3: /*
   4:  * Author: Peter J. Nicklin
   5:  */
   6: #include <ctype.h>
   7: #include <stdio.h>
   8: #include "macro.h"
   9: #include "null.h"
  10: #include "pgrep.h"
  11: #include "slist.h"
  12: #include "yesno.h"
  13: 
  14: #define DEPENDMARK      "###"
  15: 
  16: static char Iobuf[BUFSIZ];      /* I/O line buffer */
  17: static short Continue;          /* does the line continue? */
  18: 
  19: /*
  20:  * dependmark() returns 1 if the current input line begins with a string
  21:  * marking the beginning of generated dependency lines, otherwise zero.
  22:  */
  23: dependmark()
  24: 
  25: {
  26:     if (EQUAL(Iobuf, DEPENDMARK))
  27:         return(1);
  28:     return(0);
  29: }
  30: 
  31: 
  32: 
  33: /*
  34:  * findmacro() searchs a line for a macro definition. Returns the name,
  35:  * or null if not found.
  36:  */
  37: char *
  38: findmacro(macroname)
  39:     char *macroname;        /* macro name receiving buffer */
  40: {
  41:     register char *bp;      /* buffer pointer */
  42:     register char *mp;      /* macro name pointer */
  43: 
  44:     bp = Iobuf;
  45:     mp = macroname;
  46:     while (*bp == ' ')
  47:         bp++;
  48:     if (!isalnum(*bp))
  49:         return(NULL);
  50:     while(isalnum(*bp))
  51:         *mp++ = *bp++;
  52:     *mp = '\0';
  53:     while(*bp == ' ' || *bp == '\t')
  54:         bp++;
  55:     if (*bp != '=')
  56:         return(NULL);
  57:     return(macroname);
  58: }
  59: 
  60: 
  61: 
  62: /*
  63:  * getlin() stores a line from input stream in Iobuf. The string is terminated
  64:  * by a newline character which is replaced by a null character. getlin()
  65:  * returns Iobuf, or null pointer upon end of file.
  66:  */
  67: char *
  68: getlin(stream)
  69:     register FILE *stream;      /* input stream */
  70: {
  71:     register int c;         /* current character */
  72:     register char *iop;     /* Iobuf pointer */
  73: 
  74:     iop = Iobuf;
  75:     while ((c = getc(stream)) != '\n' && c != EOF)
  76:         *iop++ = c;
  77:     if (c == EOF && iop == Iobuf)
  78:         return(NULL);
  79:     if (iop != Iobuf && iop[-1] == '\\')
  80:         {
  81:         iop[-1] = '\0';
  82:         Continue = YES;
  83:         }
  84:     else    {
  85:         iop[0] = '\0';
  86:         Continue = NO;
  87:         }
  88:     return(Iobuf);
  89: }
  90: 
  91: 
  92: 
  93: /*
  94:  * getmacro() loads the body of a macro definition into slist and returns
  95:  * a pointer to slist. If the macro definition continues on more than
  96:  * one line further lines are fetched from the input stream. Returns NO
  97:  * if out of memory, otherwise YES.
  98:  */
  99: getmacro(slist, stream)
 100:     register SLIST *slist;      /* singly-linked list */
 101:     register FILE *stream;      /* input stream */
 102: {
 103:     register char *bp;      /* buffer pointer */
 104:     char mdefbuf[MACRODEFSIZE]; /* macro definition buffer */
 105:     char *getlin();         /* get a line from input stream */
 106:     char *gettoken();       /* get next token */
 107:     char *slappend();       /* append key */
 108: 
 109:     bp = Iobuf;
 110:     while (*bp++ != '=')
 111:         continue;
 112:     while ((bp = gettoken(mdefbuf, bp)) != NULL)
 113:         if (slappend(mdefbuf, slist) == NULL)
 114:             return(NO);
 115:     while (Continue == YES)
 116:         {
 117:         if (getlin(stream) == NULL)
 118:             break;
 119:         bp = Iobuf;
 120:         while ((bp = gettoken(mdefbuf, bp)) != NULL)
 121:             if (slappend(mdefbuf, slist) == NULL)
 122:                 return(NO);
 123:         }
 124:     return(YES);
 125: }
 126: 
 127: 
 128: 
 129: /*
 130:  * gettoken() copies the next token from token buffer to token. Returns a
 131:  * pointer to the first character after the token, or null upon reaching
 132:  * the end of the token buffer.
 133:  */
 134: char *
 135: gettoken(token, tp)
 136:     register char *token;       /* receiving token */
 137:     register char *tp;      /* token buffer pointer */
 138: {
 139:     while (isspace(*tp) && *tp != '\0')
 140:         tp++;
 141:     if (*tp == '\0')
 142:         {
 143:         *token = '\0';
 144:         return(NULL);
 145:         }
 146:     while (!isspace(*tp) && *tp != '\0')
 147:         *token++ = *tp++;
 148:     *token = '\0';
 149:     return(tp);
 150: }
 151: 
 152: 
 153: 
 154: /*
 155:  * readmf() reads a makefile and loads file names from HEADERS and SOURCE
 156:  * macros into a singly-linked list. Returns NO on error, otherwise YES.
 157:  */
 158: readmf(mfname, filelist)
 159:     char *mfname;           /* name of makefile */
 160:     SLIST *filelist;        /* file name list */
 161: {
 162:     char *findmacro();      /* is the line a macro definition? */
 163:     char *getlin();         /* get a line from input stream */
 164:     char macroname[MACRONAMSIZE];   /* macro name buffer */
 165:     FILE *fopen();          /* open file */
 166:     FILE *fp;           /* file pointer */
 167:     int dependmark();       /* generated dependency line? */
 168:     int getmacro();         /* get macro def from input stream */
 169:     SLIST *headlist;        /* header file name list */
 170:     SLIST *slinit();        /* initialize list */
 171:     SLIST *srclist;         /* source file name list */
 172:     void slsplice();        /* splice lists together */
 173: 
 174:     headlist = slinit();
 175:     srclist = slinit();
 176: 
 177:     if ((fp = fopen(mfname, "r")) == NULL)
 178:         {
 179:         pperror(mfname);
 180:         return(NO);
 181:         }
 182:     while (getlin(fp) != NULL)
 183:         {
 184:         if (dependmark())
 185:             break;
 186:         if (findmacro(macroname) != NULL)
 187:             {
 188:             if (EQUAL(macroname, MHEADERS))
 189:                 {
 190:                 if (getmacro(headlist, fp) == NO)
 191:                     return(NO);
 192:                 }
 193:             else if (EQUAL(macroname, MSOURCE))
 194:                 {
 195:                 if (getmacro(srclist, fp) == NO)
 196:                     return(NO);
 197:                 }
 198:             }
 199:         }
 200:     fclose(fp);
 201: 
 202:     /* splice header files to file list */
 203:     slsplice(filelist, headlist);
 204: 
 205:     /* splice source files to file list */
 206:     slsplice(filelist, srclist);
 207: 
 208:     return(YES);
 209: }

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Defined macros