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pc: treat EOF gracefully, allowing easier use within sam command language

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Sigrid 2020-12-15 14:25:59 +01:00
parent 3749e92cdb
commit d0c6ade53d
1 changed files with 11 additions and 6 deletions
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17
sys/src/cmd/pc.y
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@ -7,7 +7,7 @@
#include <thread.h>
#include <libsec.h>
int inbase = 10, outbase, divmode, sep, heads, fail, prompt;
int inbase = 10, outbase, divmode, sep, heads, fail, prompt, eof;
enum { MAXARGS = 16 };
typedef struct Num Num;
@ -591,18 +591,23 @@ yylex(void)
int c, b;
char buf[512], *p;
Keyword *kw;
if(prompt && !prompted) {print("; "); prompted = 1;}
if(prompt && !prompted && !eof) {print("; "); prompted = 1;}
do
c = Bgetc(in);
while(c != '\n' && isspace(c));
if(c == '\n') prompted = 0;
if(c < 0 && !eof){
eof = 1;
c = '\n';
}
if(c == '\n')
prompted = 0;
if(isdigit(c)){
for(p = buf, *p++ = c; c = Bgetc(in), isalnum(c) || c == '_'; )
if(p < buf + sizeof(buf) - 1 && c != '_')
*p++ = c;
*p = 0;
Bungetc(in);
if(c >= 0) Bungetc(in);
b = inbase;
p = buf;
if(*p == '0'){
@ -636,7 +641,7 @@ yylex(void)
for(; kw->name[0] == c; kw++)
if(kw->name[0] == b)
return kw->tok;
Bungetc(in);
if(c >= 0) Bungetc(in);
}
return c;
}